25311661 has 8 divisors (see below), whose sum is σ = 26648640. Its totient is φ = 23994432.

The previous prime is 25311659. The next prime is 25311683. The reversal of 25311661 is 16611352.

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

It is a cyclic number.

It is not a de Polignac number, because 25311661 - 2¹ = 25311659 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 (25311061) 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, 2271 + ... + 7468.

It is an arithmetic number, because the mean of its divisors is an integer number (3331080).

Almost surely, 2^25311661 is an apocalyptic number.

It is an amenable number.

25311661 is a deficient number, since it is larger than the sum of its proper divisors (1336979).

25311661 is a wasteful number, since it uses less digits than its factorization.

25311661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9875.

The product of its digits is 1080, while the sum is 25.

The square root of 25311661 is about 5031.0695681932. The cubic root of 25311661 is about 293.6118290282.

The spelling of 25311661 in words is "twenty-five million, three hundred eleven thousand, six hundred sixty-one".