79547939717 has 4 divisors (see below), whose sum is σ = 79757829120. Its totient is φ = 79338050316.

The previous prime is 79547939699. The next prime is 79547939767. The reversal of 79547939717 is 71793974597.

It is a happy number.

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: 71793974597 = 1867 ⋅38454191.

It is a cyclic number.

It is not a de Polignac number, because 79547939717 - 2¹⁶ = 79547874181 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 (79547939767) 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, 104944133 + ... + 104944890.

It is an arithmetic number, because the mean of its divisors is an integer number (19939457280).

Almost surely, 2^79547939717 is an apocalyptic number.

It is an amenable number.

79547939717 is a deficient number, since it is larger than the sum of its proper divisors (209889403).

79547939717 is a wasteful number, since it uses less digits than its factorization.

79547939717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209889402.

The product of its digits is 105019740, while the sum is 68.

The spelling of 79547939717 in words is "seventy-nine billion, five hundred forty-seven million, nine hundred thirty-nine thousand, seven hundred seventeen".