12455557779 has 16 divisors (see below), whose sum is σ = 18981591552. Its totient is φ = 7116826368.

The previous prime is 12455557771. The next prime is 12455557801. The reversal of 12455557779 is 97775555421.

It is not a de Polignac number, because 12455557779 - 2³ = 12455557771 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12455557771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319747 + ... + 356579.

It is an arithmetic number, because the mean of its divisors is an integer number (1186349472).

Almost surely, 2^12455557779 is an apocalyptic number.

12455557779 is a deficient number, since it is larger than the sum of its proper divisors (6526033773).

12455557779 is a wasteful number, since it uses less digits than its factorization.

12455557779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52946.

The product of its digits is 15435000, while the sum is 57.

The spelling of 12455557779 in words is "twelve billion, four hundred fifty-five million, five hundred fifty-seven thousand, seven hundred seventy-nine".