815810995404 has 60 divisors (see below), whose sum is σ = 2132814268200. Its totient is φ = 271921292352.

The previous prime is 815810995397. The next prime is 815810995429. The reversal of 815810995404 is 404599018518.

815810995404 is a `hidden beast` number, since 8 + 1 + 5 + 8 + 1 + 0 + 99 + 540 + 4 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6446167 + ... + 6571505.

It is an arithmetic number, because the mean of its divisors is an integer number (35546904470).

Almost surely, 2^815810995404 is an apocalyptic number.

It is an amenable number.

815810995404 is an abundant number, since it is smaller than the sum of its proper divisors (1317003272796).

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

815810995404 is a wasteful number, since it uses less digits than its factorization.

815810995404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145444 (or 145433 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 815810995404 in words is "eight hundred fifteen billion, eight hundred ten million, nine hundred ninety-five thousand, four hundred four".