811796519664 has 120 divisors (see below), whose sum is σ = 2449446631632. Its totient is φ = 249499514880.

The previous prime is 811796519663. The next prime is 811796519669. The reversal of 811796519664 is 466915697118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811796519663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1403119 + ... + 1895345.

Almost surely, 2^811796519664 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 811796519664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1224723315816).

811796519664 is an abundant number, since it is smaller than the sum of its proper divisors (1637650111968).

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

811796519664 is a wasteful number, since it uses less digits than its factorization.

811796519664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493135 (or 493126 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The spelling of 811796519664 in words is "eight hundred eleven billion, seven hundred ninety-six million, five hundred nineteen thousand, six hundred sixty-four".