815575885872 has 160 divisors (see below), whose sum is σ = 2349787532544. Its totient is φ = 241677004800.

The previous prime is 815575885849. The next prime is 815575885937. The reversal of 815575885872 is 278588575518.

It is a junction number, because it is equal to n+sod(n) for n = 815575885797 and 815575885806.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4762372 + ... + 4930652.

Almost surely, 2^815575885872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815575885872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1174893766272).

815575885872 is an abundant number, since it is smaller than the sum of its proper divisors (1534211646672).

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

815575885872 is a wasteful number, since it uses less digits than its factorization.

815575885872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168507 (or 168501 counting only the distinct ones).

The product of its digits is 250880000, while the sum is 69.

The spelling of 815575885872 in words is "eight hundred fifteen billion, five hundred seventy-five million, eight hundred eighty-five thousand, eight hundred seventy-two".