25909661 has 8 divisors (see below), whose sum is σ = 27091584. Its totient is φ = 24732400.

The previous prime is 25909613. The next prime is 25909679. The reversal of 25909661 is 16690952.

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 25909661 - 2¹⁰ = 25908637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25909061) 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, 15320 + ... + 16926.

It is an arithmetic number, because the mean of its divisors is an integer number (3386448).

Almost surely, 2^25909661 is an apocalyptic number.

It is an amenable number.

25909661 is a deficient number, since it is larger than the sum of its proper divisors (1181923).

25909661 is a wasteful number, since it uses less digits than its factorization.

25909661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 25909661 is about 5090.1533375725. The cubic root of 25909661 is about 295.9060946640.

The spelling of 25909661 in words is "twenty-five million, nine hundred nine thousand, six hundred sixty-one".