12556602997 has 2 divisors, whose sum is σ = 12556602998. Its totient is φ = 12556602996.

The previous prime is 12556602977. The next prime is 12556603099. The reversal of 12556602997 is 79920665521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6540118641 + 6016484356 = 80871^2 + 77566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12556602997 is a prime.

It is a super-3 number, since 3×12556602997³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12556602977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278301498 + 6278301499.

It is an arithmetic number, because the mean of its divisors is an integer number (6278301499).

Almost surely, 2^12556602997 is an apocalyptic number.

It is an amenable number.

12556602997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12556602997 is an equidigital number, since it uses as much as digits as its factorization.

12556602997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 12556602997 in words is "twelve billion, five hundred fifty-six million, six hundred two thousand, nine hundred ninety-seven".