79647123217 has 4 divisors (see below), whose sum is σ = 80255116656. Its totient is φ = 79039129780.

The previous prime is 79647123203. The next prime is 79647123229. The reversal of 79647123217 is 71232174697.

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.

It is a cyclic number.

It is not a de Polignac number, because 79647123217 - 2⁷ = 79647123089 is a prime.

It is a super-3 number, since 3×79647123217³ (a number of 34 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79647123247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303996523 + ... + 303996784.

It is an arithmetic number, because the mean of its divisors is an integer number (20063779164).

Almost surely, 2^79647123217 is an apocalyptic number.

It is an amenable number.

79647123217 is a deficient number, since it is larger than the sum of its proper divisors (607993439).

79647123217 is a wasteful number, since it uses less digits than its factorization.

79647123217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607993438.

The product of its digits is 889056, while the sum is 49.

The spelling of 79647123217 in words is "seventy-nine billion, six hundred forty-seven million, one hundred twenty-three thousand, two hundred seventeen".