79666716845 has 4 divisors (see below), whose sum is σ = 95600060220. Its totient is φ = 63733373472.

The previous prime is 79666716839. The next prime is 79666716847. The reversal of 79666716845 is 54861766697.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47469079876 + 32197636969 = 217874^2 + 179437^2 .

It is a cyclic number.

It is not a de Polignac number, because 79666716845 - 2⁶ = 79666716781 is a prime.

It is a super-2 number, since 2×79666716845² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79666716847) 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, 7966671680 + ... + 7966671689.

It is an arithmetic number, because the mean of its divisors is an integer number (23900015055).

Almost surely, 2^79666716845 is an apocalyptic number.

It is an amenable number.

79666716845 is a deficient number, since it is larger than the sum of its proper divisors (15933343375).

79666716845 is a wasteful number, since it uses less digits than its factorization.

79666716845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15933343374.

The product of its digits is 91445760, while the sum is 65.

The spelling of 79666716845 in words is "seventy-nine billion, six hundred sixty-six million, seven hundred sixteen thousand, eight hundred forty-five".