25161555 has 16 divisors (see below), whose sum is σ = 40322304. Its totient is φ = 13398240.

The previous prime is 25161551. The next prime is 25161571. The reversal of 25161555 is 55516152.

It is not a de Polignac number, because 25161555 - 2² = 25161551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25161551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14652 + ... + 16278.

It is an arithmetic number, because the mean of its divisors is an integer number (2520144).

Almost surely, 2^25161555 is an apocalyptic number.

25161555 is a deficient number, since it is larger than the sum of its proper divisors (15160749).

25161555 is a wasteful number, since it uses less digits than its factorization.

25161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666.

The product of its digits is 7500, while the sum is 30.

The square root of 25161555 is about 5016.1294839747. The cubic root of 25161555 is about 293.0302748404.

The spelling of 25161555 in words is "twenty-five million, one hundred sixty-one thousand, five hundred fifty-five".