25660261 has 8 divisors (see below), whose sum is σ = 28589184. Its totient is φ = 22830720.

The previous prime is 25660247. The next prime is 25660319. The reversal of 25660261 is 16206652.

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

It is not a de Polignac number, because 25660261 - 2⁷ = 25660133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25660211) 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, 24300 + ... + 25333.

It is an arithmetic number, because the mean of its divisors is an integer number (3573648).

Almost surely, 2^25660261 is an apocalyptic number.

It is an amenable number.

25660261 is a deficient number, since it is larger than the sum of its proper divisors (2928923).

25660261 is a wasteful number, since it uses less digits than its factorization.

25660261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49691.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25660261 is about 5065.5958188549. The cubic root of 25660261 is about 294.9535922401.

It can be divided in two parts, 25660 and 261, that added together give a square (25921 = 161²).

The spelling of 25660261 in words is "twenty-five million, six hundred sixty thousand, two hundred sixty-one".