61525363680 has 432 divisors, whose sum is σ = 244364217552. Its totient is φ = 14037196800.

The previous prime is 61525363667. The next prime is 61525363807. The reversal of 61525363680 is 8636352516.

61525363680 is a `hidden beast` number, since 6 + 1 + 5 + 2 + 5 + 3 + 636 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 2951695 + ... + 2972465.

It is an arithmetic number, because the mean of its divisors is an integer number (565657911).

Almost surely, 2^61525363680 is an apocalyptic number.

61525363680 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 61525363680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122182108776).

61525363680 is an abundant number, since it is smaller than the sum of its proper divisors (182838853872).

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

61525363680 is a wasteful number, since it uses less digits than its factorization.

61525363680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20831 (or 20809 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 61525363680 in words is "sixty-one billion, five hundred twenty-five million, three hundred sixty-three thousand, six hundred eighty".