25263751257 has 32 divisors (see below), whose sum is σ = 38533440000. Its totient is φ = 16349767056.

The previous prime is 25263751243. The next prime is 25263751291. The reversal of 25263751257 is 75215736252.

25263751257 is a `hidden beast` number, since 2 + 5 + 2 + 637 + 5 + 1 + 2 + 5 + 7 = 666.

It is not a de Polignac number, because 25263751257 - 2⁶ = 25263751193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25263752257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122494 + ... + 255992.

It is an arithmetic number, because the mean of its divisors is an integer number (1204170000).

Almost surely, 2^25263751257 is an apocalyptic number.

25263751257 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25263751257 is a deficient number, since it is larger than the sum of its proper divisors (13269688743).

25263751257 is a wasteful number, since it uses less digits than its factorization.

25263751257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133714 (or 133708 counting only the distinct ones).

The product of its digits is 882000, while the sum is 45.

The spelling of 25263751257 in words is "twenty-five billion, two hundred sixty-three million, seven hundred fifty-one thousand, two hundred fifty-seven".