25561533 has 16 divisors (see below), whose sum is σ = 35721216. Its totient is φ = 16228080.

The previous prime is 25561519. The next prime is 25561541. The reversal of 25561533 is 33516552.

It is not a de Polignac number, because 25561533 - 2⁶ = 25561469 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25561533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561553) 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, 18016 + ... + 19382.

It is an arithmetic number, because the mean of its divisors is an integer number (2232576).

Almost surely, 2^25561533 is an apocalyptic number.

25561533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25561533 is a deficient number, since it is larger than the sum of its proper divisors (10159683).

25561533 is a wasteful number, since it uses less digits than its factorization.

25561533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664.

The product of its digits is 13500, while the sum is 30.

The square root of 25561533 is about 5055.8414729894. The cubic root of 25561533 is about 294.5748275168.

The spelling of 25561533 in words is "twenty-five million, five hundred sixty-one thousand, five hundred thirty-three".