7979698081139 has 4 divisors (see below), whose sum is σ = 8149478891424. Its totient is φ = 7809917270856.

The previous prime is 7979698081129. The next prime is 7979698081163. The reversal of 7979698081139 is 9311808969797.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7979698081139 - 2¹⁶ = 7979698015603 is a prime.

It is a super-2 number, since 2×7979698081139² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7979698081139.

It is not an unprimeable number, because it can be changed into a prime (7979698081129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84890405072 + ... + 84890405165.

It is an arithmetic number, because the mean of its divisors is an integer number (2037369722856).

Almost surely, 2^{7979698081139} is an apocalyptic number.

7979698081139 is a deficient number, since it is larger than the sum of its proper divisors (169780810285).

7979698081139 is a wasteful number, since it uses less digits than its factorization.

7979698081139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169780810284.

The product of its (nonzero) digits is 370355328, while the sum is 77.

The spelling of 7979698081139 in words is "seven trillion, nine hundred seventy-nine billion, six hundred ninety-eight million, eighty-one thousand, one hundred thirty-nine".