25516643 has 16 divisors (see below), whose sum is σ = 28071360. Its totient is φ = 23095296.

The previous prime is 25516633. The next prime is 25516651. The reversal of 25516643 is 34661552.

It is a cyclic number.

It is not a de Polignac number, because 25516643 - 2¹⁰ = 25515619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25516633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70898 + ... + 71256.

It is an arithmetic number, because the mean of its divisors is an integer number (1754460).

Almost surely, 2^25516643 is an apocalyptic number.

25516643 is a deficient number, since it is larger than the sum of its proper divisors (2554717).

25516643 is a wasteful number, since it uses less digits than its factorization.

25516643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526.

The product of its digits is 21600, while the sum is 32.

The square root of 25516643 is about 5051.4001029418. The cubic root of 25516643 is about 294.4022868430.

The spelling of 25516643 in words is "twenty-five million, five hundred sixteen thousand, six hundred forty-three".