25561157 has 4 divisors (see below), whose sum is σ = 25601676. Its totient is φ = 25520640.

The previous prime is 25561147. The next prime is 25561189. The reversal of 25561157 is 75116552.

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 13734436 + 11826721 = 3706^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 25561157 - 2¹⁰ = 25560133 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 (25561147) 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, 19298 + ... + 20579.

It is an arithmetic number, because the mean of its divisors is an integer number (6400419).

Almost surely, 2^25561157 is an apocalyptic number.

It is an amenable number.

25561157 is a deficient number, since it is larger than the sum of its proper divisors (40519).

25561157 is an equidigital number, since it uses as much as digits as its factorization.

25561157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40518.

The product of its digits is 10500, while the sum is 32.

The square root of 25561157 is about 5055.8042881425. The cubic root of 25561157 is about 294.5733831502.

The spelling of 25561157 in words is "twenty-five million, five hundred sixty-one thousand, one hundred fifty-seven".