79765430791 has 4 divisors (see below), whose sum is σ = 79786299232. Its totient is φ = 79744562352.

The previous prime is 79765430777. The next prime is 79765430809. The reversal of 79765430791 is 19703456797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19703456797 = 41 ⋅480572117.

It is a cyclic number.

It is not a de Polignac number, because 79765430791 - 2⁷ = 79765430663 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 (79765430891) 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, 10428486 + ... + 10436131.

It is an arithmetic number, because the mean of its divisors is an integer number (19946574808).

Almost surely, 2^79765430791 is an apocalyptic number.

79765430791 is a deficient number, since it is larger than the sum of its proper divisors (20868441).

79765430791 is a wasteful number, since it uses less digits than its factorization.

79765430791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20868440.

The product of its (nonzero) digits is 10001880, while the sum is 58.

The spelling of 79765430791 in words is "seventy-nine billion, seven hundred sixty-five million, four hundred thirty thousand, seven hundred ninety-one".