81574712052 has 24 divisors (see below), whose sum is σ = 190353512832. Its totient is φ = 27189782400.

The previous prime is 81574712017. The next prime is 81574712059. The reversal of 81574712052 is 25021747518.

It is a junction number, because it is equal to n+sod(n) for n = 81574711995 and 81574712013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81574712059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26524 + ... + 404787.

It is an arithmetic number, because the mean of its divisors is an integer number (7931396368).

Almost surely, 2^81574712052 is an apocalyptic number.

It is an amenable number.

81574712052 is an abundant number, since it is smaller than the sum of its proper divisors (108778800780).

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

81574712052 is a wasteful number, since it uses less digits than its factorization.

81574712052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447079 (or 447077 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The spelling of 81574712052 in words is "eighty-one billion, five hundred seventy-four million, seven hundred twelve thousand, fifty-two".