666631031 has 8 divisors (see below), whose sum is σ = 728467344. Its totient is φ = 605000320.

The previous prime is 666631019. The next prime is 666631051. The reversal of 666631031 is 130136666.

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 666631031 - 2¹⁴ = 666614647 is a prime.

It is a super-2 number, since 2×666631031² = 888793862984245922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666631051) 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 7 ways as a sum of consecutive naturals, for example, 44576 + ... + 57621.

It is an arithmetic number, because the mean of its divisors is an integer number (91058418).

Almost surely, 2^666631031 is an apocalyptic number.

666631031 is a deficient number, since it is larger than the sum of its proper divisors (61836313).

666631031 is a wasteful number, since it uses less digits than its factorization.

666631031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102801.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 666631031 is about 25819.1988837764. The cubic root of 666631031 is about 873.5648991478.

Adding to 666631031 its reverse (130136666), we get a palindrome (796767697).

The spelling of 666631031 in words is "six hundred sixty-six million, six hundred thirty-one thousand, thirty-one".