81855465376886 has 16 divisors (see below), whose sum is σ = 123013240812000. Its totient is φ = 40851079621248.

The previous prime is 81855465376873. The next prime is 81855465376913. The reversal of 81855465376886 is 68867356455818.

81855465376886 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 81855465376886.

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, 1078355 + ... + 12840318.

It is an arithmetic number, because the mean of its divisors is an integer number (7688327550750).

Almost surely, 2^{81855465376886} is an apocalyptic number.

81855465376886 is a deficient number, since it is larger than the sum of its proper divisors (41157775435114).

81855465376886 is a wasteful number, since it uses less digits than its factorization.

81855465376886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13924183.

The product of its digits is 9289728000, while the sum is 80.

The spelling of 81855465376886 in words is "eighty-one trillion, eight hundred fifty-five billion, four hundred sixty-five million, three hundred seventy-six thousand, eight hundred eighty-six".