631659440691 has 6 divisors (see below), whose sum is σ = 912396969900. Its totient is φ = 421106293788.

The previous prime is 631659440683. The next prime is 631659440729. The reversal of 631659440691 is 196044956136.

It is a happy number.

631659440691 is a `hidden beast` number, since 6 + 3 + 1 + 6 + 594 + 40 + 6 + 9 + 1 = 666.

It is not a de Polignac number, because 631659440691 - 2³ = 631659440683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631659445691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35092191141 + ... + 35092191158.

It is an arithmetic number, because the mean of its divisors is an integer number (152066161650).

Almost surely, 2^631659440691 is an apocalyptic number.

631659440691 is a deficient number, since it is larger than the sum of its proper divisors (280737529209).

631659440691 is a wasteful number, since it uses less digits than its factorization.

631659440691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70184382305 (or 70184382302 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 631659440691 in words is "six hundred thirty-one billion, six hundred fifty-nine million, four hundred forty thousand, six hundred ninety-one".