25556081 has 4 divisors (see below), whose sum is σ = 25620852. Its totient is φ = 25491312.

The previous prime is 25556071. The next prime is 25556119. The reversal of 25556081 is 18065552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18879025 + 6677056 = 4345^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 25556081 - 2¹⁴ = 25539697 is a prime.

It is a super-2 number, since 2×25556081² = 1306226552157122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25556021) 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 3 ways as a sum of consecutive naturals, for example, 31790 + ... + 32583.

It is an arithmetic number, because the mean of its divisors is an integer number (6405213).

Almost surely, 2^25556081 is an apocalyptic number.

It is an amenable number.

25556081 is a deficient number, since it is larger than the sum of its proper divisors (64771).

25556081 is an equidigital number, since it uses as much as digits as its factorization.

25556081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64770.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 25556081 is about 5055.3022659382. The cubic root of 25556081 is about 294.5538828138.

The spelling of 25556081 in words is "twenty-five million, five hundred fifty-six thousand, eighty-one".