999979979999 has 16 divisors (see below), whose sum is σ = 1342630464000. Its totient is φ = 719266318560.

The previous prime is 999979979993. The next prime is 999979980007.

999979979999 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 999979979999 - 2⁴ = 999979979983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999979979993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499489499 + ... + 499491500.

It is an arithmetic number, because the mean of its divisors is an integer number (83914404000).

Almost surely, 2^999979979999 is an apocalyptic number.

999979979999 is a deficient number, since it is larger than the sum of its proper divisors (342650484001).

999979979999 is a wasteful number, since it uses less digits than its factorization.

999979979999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998981030.

The product of its digits is 170852435649, while the sum is 104.

The spelling of 999979979999 in words is "nine hundred ninety-nine billion, nine hundred seventy-nine million, nine hundred seventy-nine thousand, nine hundred ninety-nine".