161220447300 has 576 divisors, whose sum is σ = 548064921600. Its totient is φ = 36181094400.

The previous prime is 161220447277. The next prime is 161220447313. The reversal of 161220447300 is 3744022161.

161220447300 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161220447300² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 931910014 + ... + 931910186.

It is an arithmetic number, because the mean of its divisors is an integer number (951501600).

Almost surely, 2^161220447300 is an apocalyptic number.

161220447300 is a gapful number since it is divisible by the number (10) 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 161220447300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274032460800).

161220447300 is an abundant number, since it is smaller than the sum of its proper divisors (386844474300).

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

161220447300 is a wasteful number, since it uses less digits than its factorization.

161220447300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

Adding to 161220447300 its reverse (3744022161), we get a palindrome (164964469461).

The spelling of 161220447300 in words is "one hundred sixty-one billion, two hundred twenty million, four hundred forty-seven thousand, three hundred".