12339561779 has 16 divisors (see below), whose sum is σ = 12830509824. Its totient is φ = 11859372000.

The previous prime is 12339561739. The next prime is 12339561797. The reversal of 12339561779 is 97716593321.

It is a cyclic number.

It is not a de Polignac number, because 12339561779 - 2⁸ = 12339561523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12339561779.

It is not an unprimeable number, because it can be changed into a prime (12339561739) 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, 699194 + ... + 716624.

It is an arithmetic number, because the mean of its divisors is an integer number (801906864).

Almost surely, 2^12339561779 is an apocalyptic number.

12339561779 is a deficient number, since it is larger than the sum of its proper divisors (490948045).

12339561779 is a wasteful number, since it uses less digits than its factorization.

12339561779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17738.

The product of its digits is 2143260, while the sum is 53.

The spelling of 12339561779 in words is "twelve billion, three hundred thirty-nine million, five hundred sixty-one thousand, seven hundred seventy-nine".