25620665 has 16 divisors (see below), whose sum is σ = 35219712. Its totient is φ = 17527104.

The previous prime is 25620641. The next prime is 25620667. The reversal of 25620665 is 56602652.

It is not a de Polignac number, because 25620665 - 2⁸ = 25620409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25620667) 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 15 ways as a sum of consecutive naturals, for example, 26012 + ... + 26978.

It is an arithmetic number, because the mean of its divisors is an integer number (2201232).

Almost surely, 2^25620665 is an apocalyptic number.

It is an amenable number.

25620665 is a deficient number, since it is larger than the sum of its proper divisors (9599047).

25620665 is an equidigital number, since it uses as much as digits as its factorization.

25620665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736.

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

The square root of 25620665 is about 5061.6859839386. The cubic root of 25620665 is about 294.8018011779.

The spelling of 25620665 in words is "twenty-five million, six hundred twenty thousand, six hundred sixty-five".