81479888756 has 12 divisors (see below), whose sum is σ = 162959777568. Its totient is φ = 34919952312.

The previous prime is 81479888753. The next prime is 81479888797. The reversal of 81479888756 is 65788897418.

81479888756 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81479888756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81479888753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454997986 + ... + 1454998041.

It is an arithmetic number, because the mean of its divisors is an integer number (13579981464).

Almost surely, 2^81479888756 is an apocalyptic number.

It is an amenable number.

81479888756 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81479888756 is a wasteful number, since it uses less digits than its factorization.

81479888756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909996038 (or 2909996036 counting only the distinct ones).

The product of its digits is 216760320, while the sum is 71.

The spelling of 81479888756 in words is "eighty-one billion, four hundred seventy-nine million, eight hundred eighty-eight thousand, seven hundred fifty-six".