631116642591 has 6 divisors (see below), whose sum is σ = 911612928200. Its totient is φ = 420744428388.

The previous prime is 631116642577. The next prime is 631116642599. The reversal of 631116642591 is 195246611136.

631116642591 is a `hidden beast` number, since 6 + 3 + 1 + 1 + 16 + 6 + 42 + 591 = 666.

It is not a de Polignac number, because 631116642591 - 2²³ = 631108253983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631116642599) 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, 35062035691 + ... + 35062035708.

Almost surely, 2^631116642591 is an apocalyptic number.

631116642591 is a deficient number, since it is larger than the sum of its proper divisors (280496285609).

631116642591 is a wasteful number, since it uses less digits than its factorization.

631116642591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70124071405 (or 70124071402 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 631116642591 in words is "six hundred thirty-one billion, one hundred sixteen million, six hundred forty-two thousand, five hundred ninety-one".