811169921088 has 126 divisors (see below), whose sum is σ = 2402495513262. Its totient is φ = 261667537920.

The previous prime is 811169921069. The next prime is 811169921113. The reversal of 811169921088 is 880129961118.

It can be written as a sum of positive squares in only one way, i.e., 698080302144 + 113089618944 = 835512^2 + 336288^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 179181 + ... + 1286252.

Almost surely, 2^811169921088 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 811169921088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201247756631).

811169921088 is an abundant number, since it is smaller than the sum of its proper divisors (1591325592174).

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

811169921088 is a wasteful number, since it uses less digits than its factorization.

811169921088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465513 (or 1465469 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 54.

The spelling of 811169921088 in words is "eight hundred eleven billion, one hundred sixty-nine million, nine hundred twenty-one thousand, eighty-eight".