31668662665 has 4 divisors (see below), whose sum is σ = 38002395204. Its totient is φ = 25334930128.

The previous prime is 31668662633. The next prime is 31668662677. The reversal of 31668662665 is 56626686613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11097358336 + 20571304329 = 105344^2 + 143427^2 .

It is a cyclic number.

It is not a de Polignac number, because 31668662665 - 2⁵ = 31668662633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3166866262 + ... + 3166866271.

It is an arithmetic number, because the mean of its divisors is an integer number (9500598801).

Almost surely, 2^31668662665 is an apocalyptic number.

It is an amenable number.

31668662665 is a deficient number, since it is larger than the sum of its proper divisors (6333732539).

31668662665 is an equidigital number, since it uses as much as digits as its factorization.

31668662665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6333732538.

The product of its digits is 11197440, while the sum is 55.

The spelling of 31668662665 in words is "thirty-one billion, six hundred sixty-eight million, six hundred sixty-two thousand, six hundred sixty-five".