79578634693 has 2 divisors, whose sum is σ = 79578634694. Its totient is φ = 79578634692.

The previous prime is 79578634691. The next prime is 79578634699. The reversal of 79578634693 is 39643687597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69138495364 + 10440139329 = 262942^2 + 102177^2 .

It is an emirp because it is prime and its reverse (39643687597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79578634693 - 2¹ = 79578634691 is a prime.

Together with 79578634691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79578634691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39789317346 + 39789317347.

It is an arithmetic number, because the mean of its divisors is an integer number (39789317347).

Almost surely, 2^79578634693 is an apocalyptic number.

It is an amenable number.

79578634693 is a deficient number, since it is larger than the sum of its proper divisors (1).

79578634693 is an equidigital number, since it uses as much as digits as its factorization.

79578634693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205752960, while the sum is 67.

The spelling of 79578634693 in words is "seventy-nine billion, five hundred seventy-eight million, six hundred thirty-four thousand, six hundred ninety-three".