631316665 has 8 divisors (see below), whose sum is σ = 865805760. Its totient is φ = 432902832.

The previous prime is 631316659. The next prime is 631316677. The reversal of 631316665 is 566613136.

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 631316665 - 2³ = 631316657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9018775 + ... + 9018844.

It is an arithmetic number, because the mean of its divisors is an integer number (108225720).

Almost surely, 2^631316665 is an apocalyptic number.

It is an amenable number.

631316665 is a deficient number, since it is larger than the sum of its proper divisors (234489095).

631316665 is a wasteful number, since it uses less digits than its factorization.

631316665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18037631.

The product of its digits is 58320, while the sum is 37.

The square root of 631316665 is about 25126.0157008627. The cubic root of 631316665 is about 857.8586825755.

It can be divided in two parts, 63131 and 6665, that added together give a palindrome (69796).

The spelling of 631316665 in words is "six hundred thirty-one million, three hundred sixteen thousand, six hundred sixty-five".