81941025524 has 12 divisors (see below), whose sum is σ = 144124698564. Its totient is φ = 40762540224.

The previous prime is 81941025499. The next prime is 81941025557. The reversal of 81941025524 is 42552014918.

It can be written as a sum of positive squares in 2 ways, for example, as 78584908900 + 3356116624 = 280330^2 + 57932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51992249 + ... + 51993824.

It is an arithmetic number, because the mean of its divisors is an integer number (12010391547).

Almost surely, 2^81941025524 is an apocalyptic number.

It is an amenable number.

81941025524 is a deficient number, since it is larger than the sum of its proper divisors (62183673040).

81941025524 is a wasteful number, since it uses less digits than its factorization.

81941025524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103986274 (or 103986272 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 81941025524 in words is "eighty-one billion, nine hundred forty-one million, twenty-five thousand, five hundred twenty-four".