791517865631 has 8 divisors (see below), whose sum is σ = 801588433920. Its totient is φ = 781448581368.

The previous prime is 791517865609. The next prime is 791517865657. The reversal of 791517865631 is 136568715197.

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

It is a cyclic number.

It is not a de Polignac number, because 791517865631 - 2¹⁰ = 791517864607 is a prime.

It is a super-2 number, since 2×791517865631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791517865601) 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, 951590 + ... + 1577516.

It is an arithmetic number, because the mean of its divisors is an integer number (100198554240).

Almost surely, 2^791517865631 is an apocalyptic number.

791517865631 is a deficient number, since it is larger than the sum of its proper divisors (10070568289).

791517865631 is a wasteful number, since it uses less digits than its factorization.

791517865631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642013.

The product of its digits is 9525600, while the sum is 59.

The spelling of 791517865631 in words is "seven hundred ninety-one billion, five hundred seventeen million, eight hundred sixty-five thousand, six hundred thirty-one".