79938637451 has 4 divisors (see below), whose sum is σ = 79960055232. Its totient is φ = 79917219672.

The previous prime is 79938637417. The next prime is 79938637453. The reversal of 79938637451 is 15473683997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15473683997 = 7109 ⋅2176633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79938637451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79938637453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10703291 + ... + 10710756.

It is an arithmetic number, because the mean of its divisors is an integer number (19990013808).

Almost surely, 2^79938637451 is an apocalyptic number.

79938637451 is a deficient number, since it is larger than the sum of its proper divisors (21417781).

79938637451 is a wasteful number, since it uses less digits than its factorization.

79938637451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21417780.

The product of its digits is 34292160, while the sum is 62.

The spelling of 79938637451 in words is "seventy-nine billion, nine hundred thirty-eight million, six hundred thirty-seven thousand, four hundred fifty-one".