80432731921 has 16 divisors (see below), whose sum is σ = 81344240208. Its totient is φ = 79526707200.

The previous prime is 80432731889. The next prime is 80432731927. The reversal of 80432731921 is 12913723408.

It can be written as a sum of positive squares in 8 ways, for example, as 2200641921 + 78232090000 = 46911^2 + 279700^2 .

It is a cyclic number.

It is not a de Polignac number, because 80432731921 - 2⁵ = 80432731889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80432731927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47508151 + ... + 47509843.

It is an arithmetic number, because the mean of its divisors is an integer number (5084015013).

Almost surely, 2^80432731921 is an apocalyptic number.

It is an amenable number.

80432731921 is a deficient number, since it is larger than the sum of its proper divisors (911508287).

80432731921 is a wasteful number, since it uses less digits than its factorization.

80432731921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 80432731921 in words is "eighty billion, four hundred thirty-two million, seven hundred thirty-one thousand, nine hundred twenty-one".