81556445484 has 48 divisors (see below), whose sum is σ = 213818421600. Its totient is φ = 26880023808.

The previous prime is 81556445471. The next prime is 81556445521. The reversal of 81556445484 is 48454465518.

81556445484 is a `hidden beast` number, since 8 + 1 + 5 + 56 + 44 + 548 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 81556445484.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4232817 + ... + 4252040.

It is an arithmetic number, because the mean of its divisors is an integer number (4454550450).

Almost surely, 2^81556445484 is an apocalyptic number.

It is an amenable number.

81556445484 is an abundant number, since it is smaller than the sum of its proper divisors (132261976116).

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

81556445484 is a wasteful number, since it uses less digits than its factorization.

81556445484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484959 (or 8484951 counting only the distinct ones).

The product of its digits is 12288000, while the sum is 54.

The spelling of 81556445484 in words is "eighty-one billion, five hundred fifty-six million, four hundred forty-five thousand, four hundred eighty-four".