25356561 has 8 divisors (see below), whose sum is σ = 34119360. Its totient is φ = 16749072.

The previous prime is 25356559. The next prime is 25356563. The reversal of 25356561 is 16565352.

It is an interprime number because it is at equal distance from previous prime (25356559) and next prime (25356563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25356561 - 2¹ = 25356559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25356563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38445 + ... + 39098.

It is an arithmetic number, because the mean of its divisors is an integer number (4264920).

Almost surely, 2^25356561 is an apocalyptic number.

It is an amenable number.

25356561 is a deficient number, since it is larger than the sum of its proper divisors (8762799).

25356561 is a wasteful number, since it uses less digits than its factorization.

25356561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77655.

The product of its digits is 27000, while the sum is 33.

The square root of 25356561 is about 5035.5298628843. The cubic root of 25356561 is about 293.7853377738.

The spelling of 25356561 in words is "twenty-five million, three hundred fifty-six thousand, five hundred sixty-one".