12312855778 has 16 divisors (see below), whose sum is σ = 19559682360. Its totient is φ = 5793108736.

The previous prime is 12312855773. The next prime is 12312855791. The reversal of 12312855778 is 87755821321.

It can be written as a sum of positive squares in 4 ways, for example, as 7388605849 + 4924249929 = 85957^2 + 70173^2 .

It is not an unprimeable number, because it can be changed into a prime (12312855773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146400 + ... + 214612.

Almost surely, 2^12312855778 is an apocalyptic number.

12312855778 is a deficient number, since it is larger than the sum of its proper divisors (7246826582).

12312855778 is a wasteful number, since it uses less digits than its factorization.

12312855778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73541.

The product of its digits is 940800, while the sum is 49.

The spelling of 12312855778 in words is "twelve billion, three hundred twelve million, eight hundred fifty-five thousand, seven hundred seventy-eight".