81792661504 has 48 divisors (see below), whose sum is σ = 163937428200. Its totient is φ = 40798298112.

The previous prime is 81792661463. The next prime is 81792661547. The reversal of 81792661504 is 40516629718.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 810454 + ... + 905770.

Almost surely, 2^81792661504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81792661504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81968714100).

81792661504 is an abundant number, since it is smaller than the sum of its proper divisors (82144766696).

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

81792661504 is an equidigital number, since it uses as much as digits as its factorization.

81792661504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95758 (or 95738 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 81792661504 in words is "eighty-one billion, seven hundred ninety-two million, six hundred sixty-one thousand, five hundred four".