12925744778 has 4 divisors (see below), whose sum is σ = 19388617170. Its totient is φ = 6462872388.

The previous prime is 12925744757. The next prime is 12925744837. The reversal of 12925744778 is 87744752921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7478271529 + 5447473249 = 86477^2 + 73807^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3231436193 + ... + 3231436196.

Almost surely, 2^12925744778 is an apocalyptic number.

12925744778 is a deficient number, since it is larger than the sum of its proper divisors (6462872392).

12925744778 is an equidigital number, since it uses as much as digits as its factorization.

12925744778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462872391.

The product of its digits is 7902720, while the sum is 56.

The spelling of 12925744778 in words is "twelve billion, nine hundred twenty-five million, seven hundred forty-four thousand, seven hundred seventy-eight".