79769721999 has 24 divisors (see below), whose sum is σ = 122456886912. Its totient is φ = 45800790480.

The previous prime is 79769721991. The next prime is 79769722003. The reversal of 79769721999 is 99912796797.

It is not a de Polignac number, because 79769721999 - 2³ = 79769721991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79769721999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79769721991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3336099 + ... + 3359924.

It is an arithmetic number, because the mean of its divisors is an integer number (5102370288).

Almost surely, 2^79769721999 is an apocalyptic number.

79769721999 is a deficient number, since it is larger than the sum of its proper divisors (42687164913).

79769721999 is a wasteful number, since it uses less digits than its factorization.

79769721999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696075 (or 6696056 counting only the distinct ones).

The product of its digits is 243045684, while the sum is 75.

It can be divided in two parts, 797 and 69721999, that added together give a palindrome (69722796).

The spelling of 79769721999 in words is "seventy-nine billion, seven hundred sixty-nine million, seven hundred twenty-one thousand, nine hundred ninety-nine".