122339561779 has 4 divisors (see below), whose sum is σ = 122340554680. Its totient is φ = 122338568880.

The previous prime is 122339561737. The next prime is 122339561819. The reversal of 122339561779 is 977165933221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 122339561779 - 2²⁵ = 122306007347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122339568779) 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, 280242 + ... + 568519.

It is an arithmetic number, because the mean of its divisors is an integer number (30585138670).

Almost surely, 2^122339561779 is an apocalyptic number.

122339561779 is a deficient number, since it is larger than the sum of its proper divisors (992901).

122339561779 is an equidigital number, since it uses as much as digits as its factorization.

122339561779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992900.

The product of its digits is 4286520, while the sum is 55.

The spelling of 122339561779 in words is "one hundred twenty-two billion, three hundred thirty-nine million, five hundred sixty-one thousand, seven hundred seventy-nine".