80820399976 has 16 divisors (see below), whose sum is σ = 156763707300. Its totient is φ = 39016744704.

The previous prime is 80820399967. The next prime is 80820400033. The reversal of 80820399976 is 67999302808.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75199899076 + 5620500900 = 274226^2 + 74970^2 .

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, 174181665 + ... + 174182128.

Almost surely, 2^80820399976 is an apocalyptic number.

It is an amenable number.

80820399976 is a deficient number, since it is larger than the sum of its proper divisors (75943307324).

80820399976 is a wasteful number, since it uses less digits than its factorization.

80820399976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348363828 (or 348363824 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 80820399976 in words is "eighty billion, eight hundred twenty million, three hundred ninety-nine thousand, nine hundred seventy-six".