81401812641024 has 72 divisors (see below), whose sum is σ = 223636162751232. Its totient is φ = 26258649231360.

The previous prime is 81401812641013. The next prime is 81401812641047. The reversal of 81401812641024 is 42014621810418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1709523669 + ... + 1709571284.

Almost surely, 2^{81401812641024} is an apocalyptic number.

It is an amenable number.

81401812641024 is an abundant number, since it is smaller than the sum of its proper divisors (142234350110208).

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

81401812641024 is a wasteful number, since it uses less digits than its factorization.

81401812641024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419095003 (or 3419094989 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The spelling of 81401812641024 in words is "eighty-one trillion, four hundred one billion, eight hundred twelve million, six hundred forty-one thousand, twenty-four".