80979750981 has 24 divisors (see below), whose sum is σ = 118518266880. Its totient is φ = 53273035296.

The previous prime is 80979750977. The next prime is 80979750991. The reversal of 80979750981 is 18905797908.

It is not a de Polignac number, because 80979750981 - 2² = 80979750977 is a prime.

It is a super-2 number, since 2×80979750981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80979750911) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1264915 + ... + 1327391.

It is an arithmetic number, because the mean of its divisors is an integer number (4938261120).

Almost surely, 2^80979750981 is an apocalyptic number.

It is an amenable number.

80979750981 is a deficient number, since it is larger than the sum of its proper divisors (37538515899).

80979750981 is a wasteful number, since it uses less digits than its factorization.

80979750981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64385 (or 64382 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The spelling of 80979750981 in words is "eighty billion, nine hundred seventy-nine million, seven hundred fifty thousand, nine hundred eighty-one".