25563515 has 16 divisors (see below), whose sum is σ = 31417632. Its totient is φ = 19962624.

The previous prime is 25563509. The next prime is 25563521. The reversal of 25563515 is 51536552.

It is an interprime number because it is at equal distance from previous prime (25563509) and next prime (25563521).

It is a cyclic number.

It is not a de Polignac number, because 25563515 - 2⁶ = 25563451 is a prime.

It is a Duffinian 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, 45617 + ... + 46173.

It is an arithmetic number, because the mean of its divisors is an integer number (1963602).

Almost surely, 2^25563515 is an apocalyptic number.

25563515 is a deficient number, since it is larger than the sum of its proper divisors (5854117).

25563515 is a wasteful number, since it uses less digits than its factorization.

25563515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766.

The product of its digits is 22500, while the sum is 32.

The square root of 25563515 is about 5056.0374800826. The cubic root of 25563515 is about 294.5824409389.

The spelling of 25563515 in words is "twenty-five million, five hundred sixty-three thousand, five hundred fifteen".