79112528509 has 4 divisors (see below), whose sum is σ = 90414318304. Its totient is φ = 67810738716.

The previous prime is 79112528479. The next prime is 79112528543. The reversal of 79112528509 is 90582521197.

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: 90582521197 = 7 ⋅12940360171.

It is not a de Polignac number, because 79112528509 - 2²¹ = 79110431357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79112028509) 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, 5650894887 + ... + 5650894900.

It is an arithmetic number, because the mean of its divisors is an integer number (22603579576).

Almost surely, 2^79112528509 is an apocalyptic number.

It is an amenable number.

79112528509 is a deficient number, since it is larger than the sum of its proper divisors (11301789795).

79112528509 is a wasteful number, since it uses less digits than its factorization.

79112528509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11301789794.

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 79112528509 in words is "seventy-nine billion, one hundred twelve million, five hundred twenty-eight thousand, five hundred nine".