631668157 has 8 divisors (see below), whose sum is σ = 636451200. Its totient is φ = 626903424.

The previous prime is 631668143. The next prime is 631668173. The reversal of 631668157 is 751866136.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631668157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631668127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69069 + ... + 77677.

It is an arithmetic number, because the mean of its divisors is an integer number (79556400).

Almost surely, 2^631668157 is an apocalyptic number.

It is an amenable number.

631668157 is a deficient number, since it is larger than the sum of its proper divisors (4783043).

631668157 is a wasteful number, since it uses less digits than its factorization.

631668157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155.

The product of its digits is 181440, while the sum is 43.

The square root of 631668157 is about 25133.0093104666. The cubic root of 631668157 is about 858.0178602317.

The spelling of 631668157 in words is "six hundred thirty-one million, six hundred sixty-eight thousand, one hundred fifty-seven".