631744630561 has 4 divisors (see below), whose sum is σ = 689175960624. Its totient is φ = 574313300500.

The previous prime is 631744630523. The next prime is 631744630639. The reversal of 631744630561 is 165036447136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631744630561 - 2¹⁷ = 631744499489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631744631561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28715665015 + ... + 28715665036.

It is an arithmetic number, because the mean of its divisors is an integer number (172293990156).

Almost surely, 2^631744630561 is an apocalyptic number.

It is an amenable number.

631744630561 is a deficient number, since it is larger than the sum of its proper divisors (57431330063).

631744630561 is a wasteful number, since it uses less digits than its factorization.

631744630561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57431330062.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 631744630561 in words is "six hundred thirty-one billion, seven hundred forty-four million, six hundred thirty thousand, five hundred sixty-one".