80978642664 has 32 divisors (see below), whose sum is σ = 207154669920. Its totient is φ = 26365139136.

The previous prime is 80978642659. The next prime is 80978642677. The reversal of 80978642664 is 46624687908.

It is a junction number, because it is equal to n+sod(n) for n = 80978642598 and 80978642607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39232807 + ... + 39234870.

It is an arithmetic number, because the mean of its divisors is an integer number (6473583435).

Almost surely, 2^80978642664 is an apocalyptic number.

It is an amenable number.

80978642664 is an abundant number, since it is smaller than the sum of its proper divisors (126176027256).

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

80978642664 is a wasteful number, since it uses less digits than its factorization.

80978642664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78467729 (or 78467725 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 60.

The spelling of 80978642664 in words is "eighty billion, nine hundred seventy-eight million, six hundred forty-two thousand, six hundred sixty-four".