2557565865847 has 2 divisors, whose sum is σ = 2557565865848. Its totient is φ = 2557565865846.

The previous prime is 2557565865719. The next prime is 2557565865853. The reversal of 2557565865847 is 7485685657552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2557565865847 - 2⁷ = 2557565865719 is a prime.

It is a super-2 number, since 2×2557565865847² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2557565865847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557565865857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278782932923 + 1278782932924.

It is an arithmetic number, because the mean of its divisors is an integer number (1278782932924).

Almost surely, 2^{2557565865847} is an apocalyptic number.

2557565865847 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557565865847 is an equidigital number, since it uses as much as digits as its factorization.

2557565865847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2822400000, while the sum is 73.

The spelling of 2557565865847 in words is "two trillion, five hundred fifty-seven billion, five hundred sixty-five million, eight hundred sixty-five thousand, eight hundred forty-seven".