25663261 has 8 divisors (see below), whose sum is σ = 27692280. Its totient is φ = 23642112.

The previous prime is 25663247. The next prime is 25663273. The reversal of 25663261 is 16236652.

It can be written as a sum of positive squares in 4 ways, for example, as 1012036 + 24651225 = 1006^2 + 4965^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-25663261 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 (25663241) 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, 6045 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (3461535).

Almost surely, 2^25663261 is an apocalyptic number.

It is an amenable number.

25663261 is a deficient number, since it is larger than the sum of its proper divisors (2029019).

25663261 is a wasteful number, since it uses less digits than its factorization.

25663261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935.

The product of its digits is 12960, while the sum is 31.

The square root of 25663261 is about 5065.8919254165. The cubic root of 25663261 is about 294.9650863593.

The spelling of 25663261 in words is "twenty-five million, six hundred sixty-three thousand, two hundred sixty-one".