79129775251 has 4 divisors (see below), whose sum is σ = 79132765504. Its totient is φ = 79126785000.

The previous prime is 79129775243. The next prime is 79129775261. The reversal of 79129775251 is 15257792197.

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

It is a cyclic number.

It is not a de Polignac number, because 79129775251 - 2³ = 79129775243 is a prime.

It is a super-2 number, since 2×79129775251² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79129775192 and 79129775201.

It is not an unprimeable number, because it can be changed into a prime (79129775261) 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, 1455075 + ... + 1508476.

It is an arithmetic number, because the mean of its divisors is an integer number (19783191376).

Almost surely, 2^79129775251 is an apocalyptic number.

79129775251 is a deficient number, since it is larger than the sum of its proper divisors (2990253).

79129775251 is a wasteful number, since it uses less digits than its factorization.

79129775251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990252.

The product of its digits is 2778300, while the sum is 55.

The spelling of 79129775251 in words is "seventy-nine billion, one hundred twenty-nine million, seven hundred seventy-five thousand, two hundred fifty-one".