79631781663 has 16 divisors (see below), whose sum is σ = 121348339200. Its totient is φ = 45502123296.

The previous prime is 79631781641. The next prime is 79631781673. The reversal of 79631781663 is 36618713697.

It is not a de Polignac number, because 79631781663 - 2⁵ = 79631781631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79631781613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653638 + ... + 765836.

It is an arithmetic number, because the mean of its divisors is an integer number (7584271200).

Almost surely, 2^79631781663 is an apocalyptic number.

79631781663 is a deficient number, since it is larger than the sum of its proper divisors (41716557537).

79631781663 is a wasteful number, since it uses less digits than its factorization.

79631781663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146006.

The product of its digits is 6858432, while the sum is 57.

The spelling of 79631781663 in words is "seventy-nine billion, six hundred thirty-one million, seven hundred eighty-one thousand, six hundred sixty-three".