25435031257 has 2 divisors, whose sum is σ = 25435031258. Its totient is φ = 25435031256.

The previous prime is 25435031239. The next prime is 25435031269. The reversal of 25435031257 is 75213053452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13110479001 + 12324552256 = 114501^2 + 111016^2 .

It is a cyclic number.

It is not a de Polignac number, because 25435031257 - 2⁷ = 25435031129 is a prime.

It is not a weakly prime, because it can be changed into another prime (25435031227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717515628 + 12717515629.

It is an arithmetic number, because the mean of its divisors is an integer number (12717515629).

Almost surely, 2^25435031257 is an apocalyptic number.

It is an amenable number.

25435031257 is a deficient number, since it is larger than the sum of its proper divisors (1).

25435031257 is an equidigital number, since it uses as much as digits as its factorization.

25435031257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 25435031257 in words is "twenty-five billion, four hundred thirty-five million, thirty-one thousand, two hundred fifty-seven".