2556309248769 has 4 divisors (see below), whose sum is σ = 3408412331696. Its totient is φ = 1704206165844.

The previous prime is 2556309248737. The next prime is 2556309248791. The reversal of 2556309248769 is 9678429036552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2556309248769 - 2⁵ = 2556309248737 is a prime.

It is a super-2 number, since 2×2556309248769² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556309148769) 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, 426051541459 + ... + 426051541464.

It is an arithmetic number, because the mean of its divisors is an integer number (852103082924).

Almost surely, 2^{2556309248769} is an apocalyptic number.

It is an amenable number.

2556309248769 is a deficient number, since it is larger than the sum of its proper divisors (852103082927).

2556309248769 is an equidigital number, since it uses as much as digits as its factorization.

2556309248769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852103082926.

The product of its (nonzero) digits is 195955200, while the sum is 66.

The spelling of 2556309248769 in words is "two trillion, five hundred fifty-six billion, three hundred nine million, two hundred forty-eight thousand, seven hundred sixty-nine".