25913565 has 12 divisors (see below), whose sum is σ = 44916924. Its totient is φ = 13820544.

The previous prime is 25913533. The next prime is 25913597. The reversal of 25913565 is 56531952.

25913565 is a `hidden beast` number, since 2 + 5 + 91 + 3 + 565 = 666.

It is an interprime number because it is at equal distance from previous prime (25913533) and next prime (25913597).

It can be written as a sum of positive squares in 2 ways, for example, as 4485924 + 21427641 = 2118^2 + 4629^2 .

It is not a de Polignac number, because 25913565 - 2⁵ = 25913533 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287884 + ... + 287973.

It is an arithmetic number, because the mean of its divisors is an integer number (3743077).

Almost surely, 2^25913565 is an apocalyptic number.

It is an amenable number.

25913565 is a deficient number, since it is larger than the sum of its proper divisors (19003359).

25913565 is a wasteful number, since it uses less digits than its factorization.

25913565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575868 (or 575865 counting only the distinct ones).

The product of its digits is 40500, while the sum is 36.

The square root of 25913565 is about 5090.5368086283. The cubic root of 25913565 is about 295.9209560366.

It can be divided in two parts, 259 and 13565, that added together give a cube (13824 = 24³).

The spelling of 25913565 in words is "twenty-five million, nine hundred thirteen thousand, five hundred sixty-five".