79138663 has 4 divisors (see below), whose sum is σ = 79186680. Its totient is φ = 79090648.

The previous prime is 79138649. The next prime is 79138727. The reversal of 79138663 is 36683197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36683197 = 397 ⋅92401.

It is a cyclic number.

It is not a de Polignac number, because 79138663 - 2⁹ = 79138151 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 (79138603) 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, 21445 + ... + 24862.

It is an arithmetic number, because the mean of its divisors is an integer number (19796670).

Almost surely, 2^79138663 is an apocalyptic number.

79138663 is a deficient number, since it is larger than the sum of its proper divisors (48017).

79138663 is a wasteful number, since it uses less digits than its factorization.

79138663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48016.

The product of its digits is 163296, while the sum is 43.

The square root of 79138663 is about 8895.9914006253. The cubic root of 79138663 is about 429.3349427179.

The spelling of 79138663 in words is "seventy-nine million, one hundred thirty-eight thousand, six hundred sixty-three".