813445556736 has 120 divisors (see below), whose sum is σ = 2244376689984. Its totient is φ = 261798154240.

The previous prime is 813445556711. The next prime is 813445556767. The reversal of 813445556736 is 637655544318.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 976921 + ... + 1606631.

Almost surely, 2^813445556736 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 813445556736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122188344992).

813445556736 is an abundant number, since it is smaller than the sum of its proper divisors (1430931133248).

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

813445556736 is an equidigital number, since it uses as much as digits as its factorization.

813445556736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629790 (or 629745 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 57.

The spelling of 813445556736 in words is "eight hundred thirteen billion, four hundred forty-five million, five hundred fifty-six thousand, seven hundred thirty-six".