25615555 has 16 divisors (see below), whose sum is σ = 36342720. Its totient is φ = 16958592.

The previous prime is 25615523. The next prime is 25615559. The reversal of 25615555 is 55551652.

It is not a de Polignac number, because 25615555 - 2⁵ = 25615523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25615555.

It is not an unprimeable number, because it can be changed into a prime (25615559) 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, 11604 + ... + 13633.

It is an arithmetic number, because the mean of its divisors is an integer number (2271420).

Almost surely, 2^25615555 is an apocalyptic number.

25615555 is a deficient number, since it is larger than the sum of its proper divisors (10727165).

25615555 is a wasteful number, since it uses less digits than its factorization.

25615555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25278.

The product of its digits is 37500, while the sum is 34.

The square root of 25615555 is about 5061.1811862450. The cubic root of 25615555 is about 294.7822006281.

The spelling of 25615555 in words is "twenty-five million, six hundred fifteen thousand, five hundred fifty-five".