25990555 has 16 divisors (see below), whose sum is σ = 32649984. Its totient is φ = 19837440.

The previous prime is 25990553. The next prime is 25990561. The reversal of 25990555 is 55509952.

It is not a de Polignac number, because 25990555 - 2¹ = 25990553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25990553) 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, 10167 + ... + 12463.

It is an arithmetic number, because the mean of its divisors is an integer number (2040624).

Almost surely, 2^25990555 is an apocalyptic number.

25990555 is a deficient number, since it is larger than the sum of its proper divisors (6659429).

25990555 is a wasteful number, since it uses less digits than its factorization.

25990555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406.

The product of its (nonzero) digits is 101250, while the sum is 40.

The square root of 25990555 is about 5098.0932710181. The cubic root of 25990555 is about 296.2137297071.

The spelling of 25990555 in words is "twenty-five million, nine hundred ninety thousand, five hundred fifty-five".