2556370965749 has 2 divisors, whose sum is σ = 2556370965750. Its totient is φ = 2556370965748.

The previous prime is 2556370965737. The next prime is 2556370965773. The reversal of 2556370965749 is 9475690736552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1778640993649 + 777729972100 = 1333657^2 + 881890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556370965749 - 2²⁰ = 2556369917173 is a prime.

It is a super-2 number, since 2×2556370965749² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556370965649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278185482874 + 1278185482875.

It is an arithmetic number, because the mean of its divisors is an integer number (1278185482875).

Almost surely, 2^{2556370965749} is an apocalyptic number.

It is an amenable number.

2556370965749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556370965749 is an equidigital number, since it uses as much as digits as its factorization.

2556370965749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652000, while the sum is 68.

The spelling of 2556370965749 in words is "two trillion, five hundred fifty-six billion, three hundred seventy million, nine hundred sixty-five thousand, seven hundred forty-nine".