12345457779 has 24 divisors (see below), whose sum is σ = 18505573632. Its totient is φ = 8224613640.

The previous prime is 12345457771. The next prime is 12345457823. The reversal of 12345457779 is 97775454321.

12345457779 is a `hidden beast` number, since 1 + 23 + 4 + 545 + 7 + 7 + 79 = 666.

It is not a de Polignac number, because 12345457779 - 2³ = 12345457771 is a prime.

It is a super-2 number, since 2×12345457779² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12345457771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350362 + ... + 383984.

It is an arithmetic number, because the mean of its divisors is an integer number (771065568).

Almost surely, 2^12345457779 is an apocalyptic number.

12345457779 is a deficient number, since it is larger than the sum of its proper divisors (6160115853).

12345457779 is an equidigital number, since it uses as much as digits as its factorization.

12345457779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35149 (or 35137 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 54.

The spelling of 12345457779 in words is "twelve billion, three hundred forty-five million, four hundred fifty-seven thousand, seven hundred seventy-nine".