79111291693 has 12 divisors (see below), whose sum is σ = 93763790460. Its totient is φ = 66530248512.

The previous prime is 79111291691. The next prime is 79111291723. The reversal of 79111291693 is 39619211197.

It can be written as a sum of positive squares in 2 ways, for example, as 26069977444 + 53041314249 = 161462^2 + 230307^2 .

It is not a de Polignac number, because 79111291693 - 2¹ = 79111291691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79111291691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15228688 + ... + 15233881.

It is an arithmetic number, because the mean of its divisors is an integer number (7813649205).

Almost surely, 2^79111291693 is an apocalyptic number.

It is an amenable number.

79111291693 is a deficient number, since it is larger than the sum of its proper divisors (14652498767).

79111291693 is a wasteful number, since it uses less digits than its factorization.

79111291693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30462636 (or 30462629 counting only the distinct ones).

The product of its digits is 183708, while the sum is 49.

The spelling of 79111291693 in words is "seventy-nine billion, one hundred eleven million, two hundred ninety-one thousand, six hundred ninety-three".