811630825820 has 48 divisors (see below), whose sum is σ = 1707802390560. Its totient is φ = 324009455616.

The previous prime is 811630825799. The next prime is 811630825849. The reversal of 811630825820 is 28528036118.

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, 29315504 + ... + 29343176.

It is an arithmetic number, because the mean of its divisors is an integer number (35579216470).

Almost surely, 2^811630825820 is an apocalyptic number.

It is an amenable number.

811630825820 is an abundant number, since it is smaller than the sum of its proper divisors (896171564740).

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

811630825820 is a wasteful number, since it uses less digits than its factorization.

811630825820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30534 (or 30532 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 811630825820 in words is "eight hundred eleven billion, six hundred thirty million, eight hundred twenty-five thousand, eight hundred twenty".