2557663 has 2 divisors, whose sum is σ = 2557664. Its totient is φ = 2557662.

The previous prime is 2557649. The next prime is 2557673. The reversal of 2557663 is 3667552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2557663 - 2⁵ = 2557631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278831 + 1278832.

It is an arithmetic number, because the mean of its divisors is an integer number (1278832).

2^2557663 is an apocalyptic number.

2557663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557663 is an equidigital number, since it uses as much as digits as its factorization.

2557663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 34.

The square root of 2557663 is about 1599.2695207500. The cubic root of 2557663 is about 136.7564358337.

The spelling of 2557663 in words is "two million, five hundred fifty-seven thousand, six hundred sixty-three".