631662531985 has 16 divisors (see below), whose sum is σ = 759928646736. Its totient is φ = 504042559488.

The previous prime is 631662531949. The next prime is 631662532079. The reversal of 631662531985 is 589135266136.

It is a Cunningham number, because it is equal to 794772²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 14983718464 + 616678813521 = 122408^2 + 785289^2 .

It is a cyclic number.

It is not a de Polignac number, because 631662531985 - 2³³ = 623072597393 is a prime.

It is a super-2 number, since 2×631662531985² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3072169 + ... + 3271321.

It is an arithmetic number, because the mean of its divisors is an integer number (47495540421).

Almost surely, 2^631662531985 is an apocalyptic number.

It is an amenable number.

631662531985 is a deficient number, since it is larger than the sum of its proper divisors (128266114751).

631662531985 is a wasteful number, since it uses less digits than its factorization.

631662531985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200772.

The product of its digits is 6998400, while the sum is 55.

The spelling of 631662531985 in words is "six hundred thirty-one billion, six hundred sixty-two million, five hundred thirty-one thousand, nine hundred eighty-five".