25345374557 has 4 divisors (see below), whose sum is σ = 26219353020. Its totient is φ = 24471396096.

The previous prime is 25345374553. The next prime is 25345374559. The reversal of 25345374557 is 75547354352.

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 18570603076 + 6774771481 = 136274^2 + 82309^2 .

It is a cyclic number.

It is not a de Polignac number, because 25345374557 - 2² = 25345374553 is a prime.

It is a super-2 number, since 2×25345374557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25345374553) 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, 436989188 + ... + 436989245.

It is an arithmetic number, because the mean of its divisors is an integer number (6554838255).

Almost surely, 2^25345374557 is an apocalyptic number.

It is an amenable number.

25345374557 is a deficient number, since it is larger than the sum of its proper divisors (873978463).

25345374557 is an equidigital number, since it uses as much as digits as its factorization.

25345374557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873978462.

The product of its digits is 8820000, while the sum is 50.

The spelling of 25345374557 in words is "twenty-five billion, three hundred forty-five million, three hundred seventy-four thousand, five hundred fifty-seven".