12344511666778 has 16 divisors (see below), whose sum is σ = 18804592958760. Its totient is φ = 6076973408256.

The previous prime is 12344511666763. The next prime is 12344511666779. The reversal of 12344511666778 is 87766611544321.

It can be written as a sum of positive squares in 4 ways, for example, as 9006703247689 + 3337808419089 = 3001117^2 + 1826967^2 .

It is not an unprimeable number, because it can be changed into a prime (12344511666779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164811013 + ... + 164885896.

Almost surely, 2^{12344511666778} is an apocalyptic number.

12344511666778 is a deficient number, since it is larger than the sum of its proper divisors (6460081291982).

12344511666778 is a wasteful number, since it uses less digits than its factorization.

12344511666778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329697201.

The product of its digits is 40642560, while the sum is 61.

The spelling of 12344511666778 in words is "twelve trillion, three hundred forty-four billion, five hundred eleven million, six hundred sixty-six thousand, seven hundred seventy-eight".