25251427645 has 4 divisors (see below), whose sum is σ = 30301713180. Its totient is φ = 20201142112.

The previous prime is 25251427637. The next prime is 25251427667. The reversal of 25251427645 is 54672415252.

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 18058521924 + 7192905721 = 134382^2 + 84811^2 .

It is a cyclic number.

It is not a de Polignac number, because 25251427645 - 2³ = 25251427637 is a prime.

It is a super-2 number, since 2×25251427645² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525142760 + ... + 2525142769.

It is an arithmetic number, because the mean of its divisors is an integer number (7575428295).

Almost surely, 2^25251427645 is an apocalyptic number.

It is an amenable number.

25251427645 is a deficient number, since it is larger than the sum of its proper divisors (5050285535).

25251427645 is an equidigital number, since it uses as much as digits as its factorization.

25251427645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050285534.

The product of its digits is 672000, while the sum is 43.

The spelling of 25251427645 in words is "twenty-five billion, two hundred fifty-one million, four hundred twenty-seven thousand, six hundred forty-five".