81232102656 has 432 divisors, whose sum is σ = 253560652800. Its totient is φ = 24933961728.

The previous prime is 81232102649. The next prime is 81232102727. The reversal of 81232102656 is 65620123218.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81232102656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 287039091 + ... + 287039373.

Almost surely, 2^81232102656 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 81232102656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126780326400).

81232102656 is an abundant number, since it is smaller than the sum of its proper divisors (172328550144).

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

81232102656 is a wasteful number, since it uses less digits than its factorization.

81232102656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 81232102656 in words is "eighty-one billion, two hundred thirty-two million, one hundred two thousand, six hundred fifty-six".