2557538387 has 2 divisors, whose sum is σ = 2557538388. Its totient is φ = 2557538386.

The previous prime is 2557538369. The next prime is 2557538413. The reversal of 2557538387 is 7838357552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2557538387 - 2⁸ = 2557538131 is a prime.

It is not a weakly prime, because it can be changed into another prime (2557538587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278769193 + 1278769194.

It is an arithmetic number, because the mean of its divisors is an integer number (1278769194).

Almost surely, 2^2557538387 is an apocalyptic number.

2557538387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557538387 is an equidigital number, since it uses as much as digits as its factorization.

2557538387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056000, while the sum is 53.

The square root of 2557538387 is about 50572.1107627514. The cubic root of 2557538387 is about 1367.5421480792.

The spelling of 2557538387 in words is "two billion, five hundred fifty-seven million, five hundred thirty-eight thousand, three hundred eighty-seven".