79217589745 has 24 divisors (see below), whose sum is σ = 110593857384. Its totient is φ = 54314459136.

The previous prime is 79217589719. The next prime is 79217589809. The reversal of 79217589745 is 54798571297.

It can be written as a sum of positive squares in 4 ways, for example, as 5739729121 + 73477860624 = 75761^2 + 271068^2 .

It is not a de Polignac number, because 79217589745 - 2⁹ = 79217589233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3564207 + ... + 3586363.

It is an arithmetic number, because the mean of its divisors is an integer number (4608077391).

Almost surely, 2^79217589745 is an apocalyptic number.

It is an amenable number.

79217589745 is a deficient number, since it is larger than the sum of its proper divisors (31376267639).

79217589745 is a wasteful number, since it uses less digits than its factorization.

79217589745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36769 (or 36762 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 64.

The spelling of 79217589745 in words is "seventy-nine billion, two hundred seventeen million, five hundred eighty-nine thousand, seven hundred forty-five".