80999731670 has 192 divisors, whose sum is σ = 182344200192. Its totient is φ = 25693113600.

The previous prime is 80999731667. The next prime is 80999731679. The reversal of 80999731670 is 7613799908.

It is a super-2 number, since 2×80999731670² (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 (80999731679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20966159 + ... + 20970021.

It is an arithmetic number, because the mean of its divisors is an integer number (949709376).

Almost surely, 2^80999731670 is an apocalyptic number.

80999731670 is an abundant number, since it is smaller than the sum of its proper divisors (101344468522).

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

80999731670 is a wasteful number, since it uses less digits than its factorization.

80999731670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979 (or 3968 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 59.

The spelling of 80999731670 in words is "eighty billion, nine hundred ninety-nine million, seven hundred thirty-one thousand, six hundred seventy".