25616 has 10 divisors (see below), whose sum is σ = 49662. Its totient is φ = 12800.

The previous prime is 25609. The next prime is 25621. The reversal of 25616 is 61652.

It can be written as a sum of positive squares in only one way, i.e., 25600 + 16 = 160^2 + 4^2 .

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 13 and base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 785 + ... + 816.

2²⁵⁶¹⁶ is an apocalyptic number.

It is an amenable number.

25616 is a deficient number, since it is larger than the sum of its proper divisors (24046).

25616 is a wasteful number, since it uses less digits than its factorization.

25616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1603 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 25616 is about 160.0499921899. The cubic root of 25616 is about 29.4783907629.

It can be divided in two parts, 256 and 16, that multiplied together give a 12-th power (4096 = 2¹²).

The spelling of 25616 in words is "twenty-five thousand, six hundred sixteen".