2557540787 has 2 divisors, whose sum is σ = 2557540788. Its totient is φ = 2557540786.

The previous prime is 2557540781. The next prime is 2557540801. The reversal of 2557540787 is 7870457552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2557540787 - 2²⁴ = 2540763571 is a prime.

It is not a weakly prime, because it can be changed into another prime (2557540781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278770393 + 1278770394.

It is an arithmetic number, because the mean of its divisors is an integer number (1278770394).

Almost surely, 2^2557540787 is an apocalyptic number.

2557540787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557540787 is an equidigital number, since it uses as much as digits as its factorization.

2557540787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2744000, while the sum is 50.

The square root of 2557540787 is about 50572.1344912393. The cubic root of 2557540787 is about 1367.5425758474.

The spelling of 2557540787 in words is "two billion, five hundred fifty-seven million, five hundred forty thousand, seven hundred eighty-seven".