631706665 has 8 divisors (see below), whose sum is σ = 758309760. Its totient is φ = 505190832.

The previous prime is 631706653. The next prime is 631706671. The reversal of 631706665 is 566607136.

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 631706665 - 2⁵ = 631706633 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4659 + ... + 35848.

It is an arithmetic number, because the mean of its divisors is an integer number (94788720).

Almost surely, 2^631706665 is an apocalyptic number.

It is an amenable number.

631706665 is a deficient number, since it is larger than the sum of its proper divisors (126603095).

631706665 is a wasteful number, since it uses less digits than its factorization.

631706665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43631.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 631706665 is about 25133.7753829384. The cubic root of 631706665 is about 858.0352954837.

The spelling of 631706665 in words is "six hundred thirty-one million, seven hundred six thousand, six hundred sixty-five".