80666631 has 16 divisors (see below), whose sum is σ = 119992320. Its totient is φ = 53559000.

The previous prime is 80666627. The next prime is 80666633. The reversal of 80666631 is 13666608.

It is not a de Polignac number, because 80666631 - 2² = 80666627 is a prime.

It is a super-2 number, since 2×80666631² = 13014210713780322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80666633) 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, 826 + ... + 12728.

It is an arithmetic number, because the mean of its divisors is an integer number (7499520).

Almost surely, 2^80666631 is an apocalyptic number.

80666631 is a deficient number, since it is larger than the sum of its proper divisors (39325689).

80666631 is a wasteful number, since it uses less digits than its factorization.

80666631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12163 (or 12157 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 80666631 is about 8981.4604046335. The cubic root of 80666631 is about 432.0804730487.

The spelling of 80666631 in words is "eighty million, six hundred sixty-six thousand, six hundred thirty-one".