2557944771839 has 2 divisors, whose sum is σ = 2557944771840. Its totient is φ = 2557944771838.

The previous prime is 2557944771827. The next prime is 2557944771841. The reversal of 2557944771839 is 9381774497552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2557944771839 - 2⁸ = 2557944771583 is a prime.

Together with 2557944771841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557944770839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278972385919 + 1278972385920.

It is an arithmetic number, because the mean of its divisors is an integer number (1278972385920).

Almost surely, 2^{2557944771839} is an apocalyptic number.

2557944771839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557944771839 is an equidigital number, since it uses as much as digits as its factorization.

2557944771839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 533433600, while the sum is 71.

The spelling of 2557944771839 in words is "two trillion, five hundred fifty-seven billion, nine hundred forty-four million, seven hundred seventy-one thousand, eight hundred thirty-nine".