61420323440520 has 384 divisors, whose sum is σ = 227297629578240. Its totient is φ = 14238212651520.

The previous prime is 61420323440491. The next prime is 61420323440561. The reversal of 61420323440520 is 2504432302416.

61420323440520 is a `hidden beast` number, since 6 + 1 + 4 + 203 + 2 + 3 + 440 + 5 + 2 + 0 = 666.

61420323440520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61420323440520² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 315677107 + ... + 315871613.

It is an arithmetic number, because the mean of its divisors is an integer number (591920910360).

Almost surely, 2^{61420323440520} is an apocalyptic number.

61420323440520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61420323440520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113648814789120).

61420323440520 is an abundant number, since it is smaller than the sum of its proper divisors (165877306137720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61420323440520 is a wasteful number, since it uses less digits than its factorization.

61420323440520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198025 (or 198018 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 61420323440520 its reverse (2504432302416), we get a palindrome (63924755742936).

The spelling of 61420323440520 in words is "sixty-one trillion, four hundred twenty billion, three hundred twenty-three million, four hundred forty thousand, five hundred twenty".