791631663 has 4 divisors (see below), whose sum is σ = 1055508888. Its totient is φ = 527754440.

The previous prime is 791631629. The next prime is 791631679. The reversal of 791631663 is 366136197.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 791631663 - 2²² = 787437359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791631683) 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, 131938608 + ... + 131938613.

It is an arithmetic number, because the mean of its divisors is an integer number (263877222).

Almost surely, 2^791631663 is an apocalyptic number.

791631663 is a deficient number, since it is larger than the sum of its proper divisors (263877225).

791631663 is a wasteful number, since it uses less digits than its factorization.

791631663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263877224.

The product of its digits is 122472, while the sum is 42.

The square root of 791631663 is about 28135.9496552009. The cubic root of 791631663 is about 925.0695493846.

The spelling of 791631663 in words is "seven hundred ninety-one million, six hundred thirty-one thousand, six hundred sixty-three".