815036815320 has 256 divisors, whose sum is σ = 3021967872000. Its totient is φ = 171243749376.

The previous prime is 815036815319. The next prime is 815036815331. The reversal of 815036815320 is 23518630518.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2453736 + ... + 2766024.

It is an arithmetic number, because the mean of its divisors is an integer number (11804562000).

Almost surely, 2^815036815320 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 815036815320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1510983936000).

815036815320 is an abundant number, since it is smaller than the sum of its proper divisors (2206931056680).

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

815036815320 is a wasteful number, since it uses less digits than its factorization.

815036815320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312562 (or 312558 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 815036815320 in words is "eight hundred fifteen billion, thirty-six million, eight hundred fifteen thousand, three hundred twenty".