25517565 has 16 divisors (see below), whose sum is σ = 45364800. Its totient is φ = 13609296.

The previous prime is 25517537. The next prime is 25517573. The reversal of 25517565 is 56571552.

It is a happy number.

It is not a de Polignac number, because 25517565 - 2¹⁶ = 25452029 is a prime.

It is a super-2 number, since 2×25517565² = 1302292247058450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94375 + ... + 94644.

It is an arithmetic number, because the mean of its divisors is an integer number (2835300).

Almost surely, 2^25517565 is an apocalyptic number.

It is an amenable number.

25517565 is a deficient number, since it is larger than the sum of its proper divisors (19847235).

25517565 is a wasteful number, since it uses less digits than its factorization.

25517565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189033 (or 189027 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 25517565 is about 5051.4913639439. The cubic root of 25517565 is about 294.4058327070.

The spelling of 25517565 in words is "twenty-five million, five hundred seventeen thousand, five hundred sixty-five".