631305663 has 8 divisors (see below), whose sum is σ = 844431408. Its totient is φ = 419525184.

The previous prime is 631305617. The next prime is 631305667. The reversal of 631305663 is 366503136.

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

It is not a de Polignac number, because 631305663 - 2⁸ = 631305407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631305667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335220 + ... + 337097.

It is an arithmetic number, because the mean of its divisors is an integer number (105553926).

Almost surely, 2^631305663 is an apocalyptic number.

631305663 is a deficient number, since it is larger than the sum of its proper divisors (213125745).

631305663 is a wasteful number, since it uses less digits than its factorization.

631305663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672633.

The product of its (nonzero) digits is 29160, while the sum is 33.

The square root of 631305663 is about 25125.7967634859. The cubic root of 631305663 is about 857.8536992253.

Adding to 631305663 its reverse (366503136), we get a palindrome (997808799).

The spelling of 631305663 in words is "six hundred thirty-one million, three hundred five thousand, six hundred sixty-three".