25427197957 has 4 divisors (see below), whose sum is σ = 29059654816. Its totient is φ = 21794741100.

The previous prime is 25427197949. The next prime is 25427197973. The reversal of 25427197957 is 75979172452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25427197957 - 2³ = 25427197949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25427197937) 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, 1816228419 + ... + 1816228432.

It is an arithmetic number, because the mean of its divisors is an integer number (7264913704).

Almost surely, 2^25427197957 is an apocalyptic number.

It is an amenable number.

25427197957 is a deficient number, since it is larger than the sum of its proper divisors (3632456859).

25427197957 is an equidigital number, since it uses as much as digits as its factorization.

25427197957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632456858.

The product of its digits is 11113200, while the sum is 58.

The spelling of 25427197957 in words is "twenty-five billion, four hundred twenty-seven million, one hundred ninety-seven thousand, nine hundred fifty-seven".