25616641 has 8 divisors (see below), whose sum is σ = 26781120. Its totient is φ = 24456432.

The previous prime is 25616639. The next prime is 25616651. The reversal of 25616641 is 14661652.

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 25616641 - 2¹ = 25616639 is a prime.

It is a super-2 number, since 2×25616641² = 1312424592245762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25616611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22891 + ... + 23983.

It is an arithmetic number, because the mean of its divisors is an integer number (3347640).

Almost surely, 2^25616641 is an apocalyptic number.

It is an amenable number.

25616641 is a deficient number, since it is larger than the sum of its proper divisors (1164479).

25616641 is a wasteful number, since it uses less digits than its factorization.

25616641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its digits is 8640, while the sum is 31.

The square root of 25616641 is about 5061.2884723161. The cubic root of 25616641 is about 294.7863664425.

It can be divided in two parts, 256 and 16641, that multiplied together give a square (4260096 = 2064²).

The spelling of 25616641 in words is "twenty-five million, six hundred sixteen thousand, six hundred forty-one".