2557210657 has 2 divisors, whose sum is σ = 2557210658. Its totient is φ = 2557210656.

The previous prime is 2557210603. The next prime is 2557210673. The reversal of 2557210657 is 7560127552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2239087761 + 318122896 = 47319^2 + 17836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557210657 - 2¹⁹ = 2556686369 is a prime.

It is not a weakly prime, because it can be changed into another prime (2557210687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278605328 + 1278605329.

It is an arithmetic number, because the mean of its divisors is an integer number (1278605329).

Almost surely, 2^2557210657 is an apocalyptic number.

It is an amenable number.

2557210657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557210657 is an equidigital number, since it uses as much as digits as its factorization.

2557210657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147000, while the sum is 40.

The square root of 2557210657 is about 50568.8704342899. The cubic root of 2557210657 is about 1367.4837320471.

The spelling of 2557210657 in words is "two billion, five hundred fifty-seven million, two hundred ten thousand, six hundred fifty-seven".