66976631 has 8 divisors (see below), whose sum is σ = 69541200. Its totient is φ = 64429120.

The previous prime is 66976627. The next prime is 66976639. The reversal of 66976631 is 13667966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66976631 - 2² = 66976627 is a prime.

It is a super-2 number, since 2×66976631² = 8971738200220322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4040 + ... + 12258.

It is an arithmetic number, because the mean of its divisors is an integer number (8692650).

Almost surely, 2^66976631 is an apocalyptic number.

66976631 is a deficient number, since it is larger than the sum of its proper divisors (2564569).

66976631 is a wasteful number, since it uses less digits than its factorization.

66976631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8529.

The product of its digits is 244944, while the sum is 44.

The square root of 66976631 is about 8183.9251585043. The cubic root of 66976631 is about 406.1075834999.

The spelling of 66976631 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred thirty-one".