81810794876 has 12 divisors (see below), whose sum is σ = 144506918808. Its totient is φ = 40523103792.

The previous prime is 81810794851. The next prime is 81810794887. The reversal of 81810794876 is 67849701818.

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, 95572931 + ... + 95573786.

It is an arithmetic number, because the mean of its divisors is an integer number (12042243234).

Almost surely, 2^81810794876 is an apocalyptic number.

It is an amenable number.

81810794876 is a deficient number, since it is larger than the sum of its proper divisors (62696123932).

81810794876 is a wasteful number, since it uses less digits than its factorization.

81810794876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191146828 (or 191146826 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 81810794876 in words is "eighty-one billion, eight hundred ten million, seven hundred ninety-four thousand, eight hundred seventy-six".