813016856172 has 54 divisors (see below), whose sum is σ = 1983280635588. Its totient is φ = 259199860128.

The previous prime is 813016856161. The next prime is 813016856177. The reversal of 813016856172 is 271658610318.

It is not an unprimeable number, because it can be changed into a prime (813016856177) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71834658 + ... + 71845974.

Almost surely, 2^813016856172 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 813016856172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991640317794).

813016856172 is an abundant number, since it is smaller than the sum of its proper divisors (1170263779416).

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

813016856172 is an equidigital number, since it uses as much as digits as its factorization.

813016856172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22687 (or 11345 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

Multiplying 813016856172 by its sum of digits (48), we get a square (39024809096256 = 6246984²).

The spelling of 813016856172 in words is "eight hundred thirteen billion, sixteen million, eight hundred fifty-six thousand, one hundred seventy-two".