25166321 has 4 divisors (see below), whose sum is σ = 25182192. Its totient is φ = 25150452.

The previous prime is 25166269. The next prime is 25166329. The reversal of 25166321 is 12366152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25166321 - 2⁶ = 25166257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25166329) 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, 5255 + ... + 8828.

It is an arithmetic number, because the mean of its divisors is an integer number (6295548).

Almost surely, 2^25166321 is an apocalyptic number.

It is an amenable number.

25166321 is a deficient number, since it is larger than the sum of its proper divisors (15871).

25166321 is a wasteful number, since it uses less digits than its factorization.

25166321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15870.

The product of its digits is 2160, while the sum is 26.

The square root of 25166321 is about 5016.6045289618. The cubic root of 25166321 is about 293.0487752089.

The spelling of 25166321 in words is "twenty-five million, one hundred sixty-six thousand, three hundred twenty-one".