25665997 has 8 divisors (see below), whose sum is σ = 29734976. Its totient is φ = 21697632.

The previous prime is 25665973. The next prime is 25666001. The reversal of 25665997 is 79956652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25665997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25665997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665947) 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, 24603 + ... + 25624.

It is an arithmetic number, because the mean of its divisors is an integer number (3716872).

Almost surely, 2^25665997 is an apocalyptic number.

It is an amenable number.

25665997 is a deficient number, since it is larger than the sum of its proper divisors (4068979).

25665997 is an equidigital number, since it uses as much as digits as its factorization.

25665997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50307.

The product of its digits is 1020600, while the sum is 49.

The square root of 25665997 is about 5066.1619595114. The cubic root of 25665997 is about 294.9755682151.

It can be divided in two parts, 25665 and 997, that added together give a palindrome (26662).

The spelling of 25665997 in words is "twenty-five million, six hundred sixty-five thousand, nine hundred ninety-seven".