79257819193 has 4 divisors (see below), whose sum is σ = 90580364800. Its totient is φ = 67935273588.

The previous prime is 79257819149. The next prime is 79257819233. The reversal of 79257819193 is 39191875297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39191875297 = 1523 ⋅25733339.

It is not a de Polignac number, because 79257819193 - 2¹⁷ = 79257688121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79257819793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5661272793 + ... + 5661272806.

It is an arithmetic number, because the mean of its divisors is an integer number (22645091200).

Almost surely, 2^79257819193 is an apocalyptic number.

It is an amenable number.

79257819193 is a deficient number, since it is larger than the sum of its proper divisors (11322545607).

79257819193 is a wasteful number, since it uses less digits than its factorization.

79257819193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11322545606.

The product of its digits is 8573040, while the sum is 61.

The spelling of 79257819193 in words is "seventy-nine billion, two hundred fifty-seven million, eight hundred nineteen thousand, one hundred ninety-three".