820564111976 has 16 divisors (see below), whose sum is σ = 1758351668640. Its totient is φ = 351670333680.

The previous prime is 820564111963. The next prime is 820564111981. The reversal of 820564111976 is 679111465028.

It is a super-2 number, since 2×820564111976² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7326465230 + ... + 7326465341.

It is an arithmetic number, because the mean of its divisors is an integer number (109896979290).

Almost surely, 2^820564111976 is an apocalyptic number.

It is an amenable number.

820564111976 is an abundant number, since it is smaller than the sum of its proper divisors (937787556664).

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

820564111976 is a wasteful number, since it uses less digits than its factorization.

820564111976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14652930584 (or 14652930580 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 820564111976 in words is "eight hundred twenty billion, five hundred sixty-four million, one hundred eleven thousand, nine hundred seventy-six".