79999999999993 has 2 divisors, whose sum is σ = 79999999999994. Its totient is φ = 79999999999992.

The previous prime is 79999999999987. The next prime is 80000000000027. The reversal of 79999999999993 is 39999999999997.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75227225729769 + 4772774270224 = 8673363^2 + 2184668^2 .

It is a cyclic number.

It is not a de Polignac number, because 79999999999993 - 2²⁵ = 79999966445561 is a prime.

It is not a weakly prime, because it can be changed into another prime (79999999999393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39999999999996 + 39999999999997.

It is an arithmetic number, because the mean of its divisors is an integer number (39999999999997).

Almost surely, 2^{79999999999993} is an apocalyptic number.

It is an amenable number.

79999999999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

79999999999993 is an equidigital number, since it uses as much as digits as its factorization.

79999999999993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5931020266101, while the sum is 118.

It can be divided in two parts, 7 and 9999999999993, that added together give a 13-th power (10000000000000 = 10¹³).

The spelling of 79999999999993 in words is "seventy-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".