12556722340 has 12 divisors (see below), whose sum is σ = 26369116956. Its totient is φ = 5022688928.

The previous prime is 12556722319. The next prime is 12556722341. The reversal of 12556722340 is 4322765521.

It can be written as a sum of positive squares in 2 ways, for example, as 5422555044 + 7134167296 = 73638^2 + 84464^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12556722340.

It is not an unprimeable number, because it can be changed into a prime (12556722341) 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, 313918039 + ... + 313918078.

It is an arithmetic number, because the mean of its divisors is an integer number (2197426413).

Almost surely, 2^12556722340 is an apocalyptic number.

12556722340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12556722340 is an abundant number, since it is smaller than the sum of its proper divisors (13812394616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12556722340 is a wasteful number, since it uses less digits than its factorization.

12556722340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627836126 (or 627836124 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 12556722340 in words is "twelve billion, five hundred fifty-six million, seven hundred twenty-two thousand, three hundred forty".