815808233972 has 24 divisors (see below), whose sum is σ = 1435722360072. Its totient is φ = 405602380800.

The previous prime is 815808233969. The next prime is 815808233983. The reversal of 815808233972 is 279332808518.

It can be written as a sum of positive squares in 4 ways, for example, as 354174955876 + 461633278096 = 595126^2 + 679436^2 .

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, 6483368 + ... + 6608000.

It is an arithmetic number, because the mean of its divisors is an integer number (59821765003).

Almost surely, 2^815808233972 is an apocalyptic number.

It is an amenable number.

815808233972 is a deficient number, since it is larger than the sum of its proper divisors (619914126100).

815808233972 is a wasteful number, since it uses less digits than its factorization.

815808233972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133859 (or 133857 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 815808233972 in words is "eight hundred fifteen billion, eight hundred eight million, two hundred thirty-three thousand, nine hundred seventy-two".