81625250704 has 20 divisors (see below), whose sum is σ = 160741530460. Its totient is φ = 40143565440.

The previous prime is 81625250701. The next prime is 81625250717. The reversal of 81625250704 is 40705252618.

It can be written as a sum of positive squares in 2 ways, for example, as 33204128400 + 48421122304 = 182220^2 + 220048^2 .

It is not an unprimeable number, because it can be changed into a prime (81625250701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41815239 + ... + 41817190.

It is an arithmetic number, because the mean of its divisors is an integer number (8037076523).

Almost surely, 2^81625250704 is an apocalyptic number.

It is an amenable number.

81625250704 is a deficient number, since it is larger than the sum of its proper divisors (79116279756).

81625250704 is a wasteful number, since it uses less digits than its factorization.

81625250704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83632498 (or 83632492 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 81625250704 in words is "eighty-one billion, six hundred twenty-five million, two hundred fifty thousand, seven hundred four".