2556404520169 has 2 divisors, whose sum is σ = 2556404520170. Its totient is φ = 2556404520168.

The previous prime is 2556404520167. The next prime is 2556404520281. The reversal of 2556404520169 is 9610254046552.

2556404520169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2342849625769 + 213554894400 = 1530637^2 + 462120^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556404520169 - 2¹ = 2556404520167 is a prime.

It is a super-2 number, since 2×2556404520169² (a number of 26 digits) contains 22 as substring.

Together with 2556404520167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2556404520161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278202260084 + 1278202260085.

It is an arithmetic number, because the mean of its divisors is an integer number (1278202260085).

Almost surely, 2^{2556404520169} is an apocalyptic number.

It is an amenable number.

2556404520169 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556404520169 is an equidigital number, since it uses as much as digits as its factorization.

2556404520169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 2556404520169 in words is "two trillion, five hundred fifty-six billion, four hundred four million, five hundred twenty thousand, one hundred sixty-nine".