25424245251 has 20 divisors (see below), whose sum is σ = 37983829224. Its totient is φ = 16947532800.

The previous prime is 25424245247. The next prime is 25424245289. The reversal of 25424245251 is 15254242452.

It is not a de Polignac number, because 25424245251 - 2² = 25424245247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25424245051) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1129416 + ... + 1151706.

Almost surely, 2^25424245251 is an apocalyptic number.

25424245251 is a deficient number, since it is larger than the sum of its proper divisors (12559583973).

25424245251 is a wasteful number, since it uses less digits than its factorization.

25424245251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36384 (or 36375 counting only the distinct ones).

The product of its digits is 128000, while the sum is 36.

The spelling of 25424245251 in words is "twenty-five billion, four hundred twenty-four million, two hundred forty-five thousand, two hundred fifty-one".