811156913240 has 64 divisors (see below), whose sum is σ = 1965889474560. Its totient is φ = 300344204160.

The previous prime is 811156913239. The next prime is 811156913321. The reversal of 811156913240 is 42319651118.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14192324 + ... + 14249363.

It is an arithmetic number, because the mean of its divisors is an integer number (30717023040).

Almost surely, 2^811156913240 is an apocalyptic number.

It is an amenable number.

811156913240 is an abundant number, since it is smaller than the sum of its proper divisors (1154732561320).

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

811156913240 is a wasteful number, since it uses less digits than its factorization.

811156913240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28441752 (or 28441748 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 811156913240 in words is "eight hundred eleven billion, one hundred fifty-six million, nine hundred thirteen thousand, two hundred forty".