79991563108 has 6 divisors (see below), whose sum is σ = 139985235446. Its totient is φ = 39995781552.

The previous prime is 79991563061. The next prime is 79991563117. The reversal of 79991563108 is 80136519997.

It can be written as a sum of positive squares in only one way, i.e., 42025820004 + 37965743104 = 205002^2 + 194848^2 .

It is a super-2 number, since 2×79991563108² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998945385 + ... + 9998945392.

Almost surely, 2^79991563108 is an apocalyptic number.

It is an amenable number.

79991563108 is a deficient number, since it is larger than the sum of its proper divisors (59993672338).

79991563108 is a wasteful number, since it uses less digits than its factorization.

79991563108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19997890781 (or 19997890779 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 58.

The spelling of 79991563108 in words is "seventy-nine billion, nine hundred ninety-one million, five hundred sixty-three thousand, one hundred eight".