25042871257 has 4 divisors (see below), whose sum is σ = 25046002996. Its totient is φ = 25039739520.

The previous prime is 25042871251. The next prime is 25042871279. The reversal of 25042871257 is 75217824052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15182182656 + 9860688601 = 123216^2 + 99301^2 .

It is a cyclic number.

It is not a de Polignac number, because 25042871257 - 2¹¹ = 25042869209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25042871251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553844 + ... + 1569877.

It is an arithmetic number, because the mean of its divisors is an integer number (6261500749).

Almost surely, 2^25042871257 is an apocalyptic number.

It is an amenable number.

25042871257 is a deficient number, since it is larger than the sum of its proper divisors (3131739).

25042871257 is an equidigital number, since it uses as much as digits as its factorization.

25042871257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131738.

The product of its (nonzero) digits is 313600, while the sum is 43.

The spelling of 25042871257 in words is "twenty-five billion, forty-two million, eight hundred seventy-one thousand, two hundred fifty-seven".