2500665257 has 2 divisors, whose sum is σ = 2500665258. Its totient is φ = 2500665256.

The previous prime is 2500665229. The next prime is 2500665281. The reversal of 2500665257 is 7525660052.

2500665257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2195953321 + 304711936 = 46861^2 + 17456^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500665257 - 2⁸ = 2500665001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2500665257.

It is not a weakly prime, because it can be changed into another prime (2500665217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250332628 + 1250332629.

It is an arithmetic number, because the mean of its divisors is an integer number (1250332629).

Almost surely, 2^2500665257 is an apocalyptic number.

It is an amenable number.

2500665257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500665257 is an equidigital number, since it uses as much as digits as its factorization.

2500665257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 2500665257 is about 50006.6521274920. The cubic root of 2500665257 is about 1357.3291833087.

The spelling of 2500665257 in words is "two billion, five hundred million, six hundred sixty-five thousand, two hundred fifty-seven".