80921779984 has 10 divisors (see below), whose sum is σ = 156785948750. Its totient is φ = 40460889984.

The previous prime is 80921779963. The next prime is 80921779993. The reversal of 80921779984 is 48997712908.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 79451824384 + 1469955600 = 281872^2 + 38340^2 .

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 as a sum of consecutive naturals, namely, 2528805609 + ... + 2528805640.

It is an arithmetic number, because the mean of its divisors is an integer number (15678594875).

Almost surely, 2^80921779984 is an apocalyptic number.

It is an amenable number.

80921779984 is a deficient number, since it is larger than the sum of its proper divisors (75864168766).

80921779984 is a wasteful number, since it uses less digits than its factorization.

80921779984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5057611257 (or 5057611251 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 64.

The spelling of 80921779984 in words is "eighty billion, nine hundred twenty-one million, seven hundred seventy-nine thousand, nine hundred eighty-four".