81351102024 has 48 divisors (see below), whose sum is σ = 220362097020. Its totient is φ = 27112579200.

The previous prime is 81351101989. The next prime is 81351102029. The reversal of 81351102024 is 42020115318.

It can be written as a sum of positive squares in 2 ways, for example, as 76756702500 + 4594399524 = 277050^2 + 67782^2 .

It is not an unprimeable number, because it can be changed into a prime (81351102029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364014 + ... + 543330.

Almost surely, 2^81351102024 is an apocalyptic number.

It is an amenable number.

81351102024 is an abundant number, since it is smaller than the sum of its proper divisors (139010994996).

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

81351102024 is a wasteful number, since it uses less digits than its factorization.

81351102024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185630 (or 185623 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 81351102024 in words is "eighty-one billion, three hundred fifty-one million, one hundred two thousand, twenty-four".