79379768781 has 6 divisors (see below), whose sum is σ = 114659666030. Its totient is φ = 52919845848.

The previous prime is 79379768749. The next prime is 79379768813. The reversal of 79379768781 is 18786797397.

It is an interprime number because it is at equal distance from previous prime (79379768749) and next prime (79379768813).

It can be written as a sum of positive squares in only one way, i.e., 58725767556 + 20654001225 = 242334^2 + 143715^2 .

It is not a de Polignac number, because 79379768781 - 2⁵ = 79379768749 is a prime.

It is a super-2 number, since 2×79379768781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79379768711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4409987146 + ... + 4409987163.

Almost surely, 2^79379768781 is an apocalyptic number.

It is an amenable number.

79379768781 is a deficient number, since it is larger than the sum of its proper divisors (35279897249).

79379768781 is a wasteful number, since it uses less digits than its factorization.

79379768781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8819974315 (or 8819974312 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 72.

The spelling of 79379768781 in words is "seventy-nine billion, three hundred seventy-nine million, seven hundred sixty-eight thousand, seven hundred eighty-one".