61591534925886 has 256 divisors, whose sum is σ = 161822361600000. Its totient is φ = 16997219366400.

The previous prime is 61591534925867. The next prime is 61591534925891. The reversal of 61591534925886 is 68852943519516.

61591534925886 is a `hidden beast` number, since 6 + 1 + 5 + 9 + 1 + 5 + 3 + 492 + 58 + 86 = 666.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4065708640 + ... + 4065723788.

It is an arithmetic number, because the mean of its divisors is an integer number (632118600000).

Almost surely, 2^{61591534925886} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61591534925886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80911180800000).

61591534925886 is an abundant number, since it is smaller than the sum of its proper divisors (100230826674114).

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

61591534925886 is a wasteful number, since it uses less digits than its factorization.

61591534925886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17304 (or 17298 counting only the distinct ones).

The product of its digits is 559872000, while the sum is 72.

The spelling of 61591534925886 in words is "sixty-one trillion, five hundred ninety-one billion, five hundred thirty-four million, nine hundred twenty-five thousand, eight hundred eighty-six".