25666397 has 8 divisors (see below), whose sum is σ = 27182400. Its totient is φ = 24166944.

The previous prime is 25666391. The next prime is 25666409. The reversal of 25666397 is 79366652.

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 25666397 - 2¹⁴ = 25650013 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 (25666391) 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, 872 + ... + 7217.

It is an arithmetic number, because the mean of its divisors is an integer number (3397800).

Almost surely, 2^25666397 is an apocalyptic number.

It is an amenable number.

25666397 is a deficient number, since it is larger than the sum of its proper divisors (1516003).

25666397 is a wasteful number, since it uses less digits than its factorization.

25666397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8275.

The product of its digits is 408240, while the sum is 44.

The square root of 25666397 is about 5066.2014369743. The cubic root of 25666397 is about 294.9771005877.

The spelling of 25666397 in words is "twenty-five million, six hundred sixty-six thousand, three hundred ninety-seven".