80406955521 has 24 divisors (see below), whose sum is σ = 122986196424. Its totient is φ = 50446970880.

The previous prime is 80406955511. The next prime is 80406955523. The reversal of 80406955521 is 12555960408.

80406955521 is a `hidden beast` number, since 8 + 0 + 4 + 0 + 6 + 95 + 552 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 226803600 + 80180151921 = 15060^2 + 283161^2 .

It is not a de Polignac number, because 80406955521 - 2²² = 80402761217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80406955523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3000301 + ... + 3026981.

It is an arithmetic number, because the mean of its divisors is an integer number (5124424851).

Almost surely, 2^80406955521 is an apocalyptic number.

It is an amenable number.

80406955521 is a deficient number, since it is larger than the sum of its proper divisors (42579240903).

80406955521 is a wasteful number, since it uses less digits than its factorization.

80406955521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46401 (or 46398 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 80406955521 in words is "eighty billion, four hundred six million, nine hundred fifty-five thousand, five hundred twenty-one".