79722865394 has 4 divisors (see below), whose sum is σ = 119584298094. Its totient is φ = 39861432696.

The previous prime is 79722865393. The next prime is 79722865403. The reversal of 79722865394 is 49356822797.

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

It can be written as a sum of positive squares in only one way, i.e., 61298332225 + 18424533169 = 247585^2 + 135737^2 .

It is not an unprimeable number, because it can be changed into a prime (79722865393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19930716347 + ... + 19930716350.

Almost surely, 2^79722865394 is an apocalyptic number.

79722865394 is a deficient number, since it is larger than the sum of its proper divisors (39861432700).

79722865394 is a wasteful number, since it uses less digits than its factorization.

79722865394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39861432699.

The product of its digits is 45722880, while the sum is 62.

The spelling of 79722865394 in words is "seventy-nine billion, seven hundred twenty-two million, eight hundred sixty-five thousand, three hundred ninety-four".