79040138269 has 4 divisors (see below), whose sum is σ = 79040703420. Its totient is φ = 79039573120.

The previous prime is 79040138257. The next prime is 79040138297. The reversal of 79040138269 is 96283104097.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27210152025 + 51829986244 = 164955^2 + 227662^2 .

It is a cyclic number.

It is not a de Polignac number, because 79040138269 - 2⁵ = 79040138237 is a prime.

It is a super-2 number, since 2×79040138269² (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 (79040138369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98637 + ... + 409645.

It is an arithmetic number, because the mean of its divisors is an integer number (19760175855).

Almost surely, 2^79040138269 is an apocalyptic number.

It is an amenable number.

79040138269 is a deficient number, since it is larger than the sum of its proper divisors (565151).

79040138269 is a wasteful number, since it uses less digits than its factorization.

79040138269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565150.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 79040138269 in words is "seventy-nine billion, forty million, one hundred thirty-eight thousand, two hundred sixty-nine".