25645555 has 16 divisors (see below), whose sum is σ = 33614784. Its totient is φ = 18668160.

The previous prime is 25645553. The next prime is 25645579. The reversal of 25645555 is 55554652.

It is not a de Polignac number, because 25645555 - 2¹ = 25645553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25645553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1837 + ... + 7393.

It is an arithmetic number, because the mean of its divisors is an integer number (2100924).

Almost surely, 2^25645555 is an apocalyptic number.

25645555 is a deficient number, since it is larger than the sum of its proper divisors (7969229).

25645555 is a wasteful number, since it uses less digits than its factorization.

25645555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5646.

The product of its digits is 150000, while the sum is 37.

The square root of 25645555 is about 5064.1440540332. The cubic root of 25645555 is about 294.8972351046.

The spelling of 25645555 in words is "twenty-five million, six hundred forty-five thousand, five hundred fifty-five".