25125557 has 4 divisors (see below), whose sum is σ = 25197900. Its totient is φ = 25053216.

The previous prime is 25125547. The next prime is 25125559. The reversal of 25125557 is 75552152.

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 22648081 + 2477476 = 4759^2 + 1574^2 .

It is a cyclic number.

It is not a de Polignac number, because 25125557 - 2⁸ = 25125301 is a prime.

It is a super-2 number, since 2×25125557² = 1262587229120498, which 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 (25125559) 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, 35648 + ... + 36345.

It is an arithmetic number, because the mean of its divisors is an integer number (6299475).

Almost surely, 2^25125557 is an apocalyptic number.

It is an amenable number.

25125557 is a deficient number, since it is larger than the sum of its proper divisors (72343).

25125557 is an equidigital number, since it uses as much as digits as its factorization.

25125557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72342.

The product of its digits is 17500, while the sum is 32.

The square root of 25125557 is about 5012.5399749029. The cubic root of 25125557 is about 292.8904644785.

The spelling of 25125557 in words is "twenty-five million, one hundred twenty-five thousand, five hundred fifty-seven".