81107558524 has 24 divisors (see below), whose sum is σ = 149984271360. Its totient is φ = 38299548144.

The previous prime is 81107558489. The next prime is 81107558537. The reversal of 81107558524 is 42585570118.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 5572504 + ... + 5587039.

It is an arithmetic number, because the mean of its divisors is an integer number (6249344640).

Almost surely, 2^81107558524 is an apocalyptic number.

It is an amenable number.

81107558524 is a deficient number, since it is larger than the sum of its proper divisors (68876712836).

81107558524 is a wasteful number, since it uses less digits than its factorization.

81107558524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159649 (or 11159647 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 46.

The spelling of 81107558524 in words is "eighty-one billion, one hundred seven million, five hundred fifty-eight thousand, five hundred twenty-four".