79999999919 has 8 divisors (see below), whose sum is σ = 91640706048. Its totient is φ = 68412327480.

The previous prime is 79999999903. The next prime is 79999999927. The reversal of 79999999919 is 91999999997.

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

It is not a de Polignac number, because 79999999919 - 2⁴ = 79999999903 is a prime.

It is a super-2 number, since 2×79999999919² (a number of 23 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 (79999999979) 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, 13255187 + ... + 13261220.

It is an arithmetic number, because the mean of its divisors is an integer number (11455088256).

Almost surely, 2^79999999919 is an apocalyptic number.

79999999919 is a deficient number, since it is larger than the sum of its proper divisors (11640706129).

79999999919 is a wasteful number, since it uses less digits than its factorization.

79999999919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26516845.

The product of its digits is 2711943423, while the sum is 89.

Adding to 79999999919 its sum of digits (89), we get a palindrome (80000000008).

It can be divided in two parts, 7999999991 and 9, that added together give a cube (8000000000 = 2000³).

The spelling of 79999999919 in words is "seventy-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred nineteen".