25606859 has 4 divisors (see below), whose sum is σ = 25628160. Its totient is φ = 25585560.

The previous prime is 25606831. The next prime is 25606871. The reversal of 25606859 is 95860652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25606859 - 2¹⁶ = 25541323 is a prime.

It is a super-3 number, since 3×25606859³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25626859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8732 + ... + 11289.

It is an arithmetic number, because the mean of its divisors is an integer number (6407040).

Almost surely, 2^25606859 is an apocalyptic number.

25606859 is a deficient number, since it is larger than the sum of its proper divisors (21301).

25606859 is a wasteful number, since it uses less digits than its factorization.

25606859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21300.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 25606859 is about 5060.3220253261. The cubic root of 25606859 is about 294.7488391783.

The spelling of 25606859 in words is "twenty-five million, six hundred six thousand, eight hundred fifty-nine".