25625665 has 8 divisors (see below), whose sum is σ = 33116328. Its totient is φ = 18923520.

The previous prime is 25625653. The next prime is 25625671. The reversal of 25625665 is 56652652.

It can be written as a sum of positive squares in 4 ways, for example, as 505521 + 25120144 = 711^2 + 5012^2 .

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

It is not a de Polignac number, because 25625665 - 2²¹ = 23528513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197056 + ... + 197185.

It is an arithmetic number, because the mean of its divisors is an integer number (4139541).

Almost surely, 2^25625665 is an apocalyptic number.

It is an amenable number.

25625665 is a deficient number, since it is larger than the sum of its proper divisors (7490663).

25625665 is a wasteful number, since it uses less digits than its factorization.

25625665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394259.

The product of its digits is 108000, while the sum is 37.

The square root of 25625665 is about 5062.1798664212. The cubic root of 25625665 is about 294.8209772757.

It can be divided in two parts, 256 and 25665, that added together give a square (25921 = 161²).

The spelling of 25625665 in words is "twenty-five million, six hundred twenty-five thousand, six hundred sixty-five".