25516623 has 8 divisors (see below), whose sum is σ = 37115136. Its totient is φ = 15464600.

The previous prime is 25516597. The next prime is 25516633. The reversal of 25516623 is 32661552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25516623 - 2⁸ = 25516367 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386583 + ... + 386648.

It is an arithmetic number, because the mean of its divisors is an integer number (4639392).

Almost surely, 2^25516623 is an apocalyptic number.

25516623 is a deficient number, since it is larger than the sum of its proper divisors (11598513).

25516623 is a wasteful number, since it uses less digits than its factorization.

25516623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773245.

The product of its digits is 10800, while the sum is 30.

The square root of 25516623 is about 5051.3981232922. The cubic root of 25516623 is about 294.4022099253.

Subtracting 25516623 from its reverse (32661552), we obtain a square (7144929 = 2673²).

The spelling of 25516623 in words is "twenty-five million, five hundred sixteen thousand, six hundred twenty-three".