25432661 has 4 divisors (see below), whose sum is σ = 25603500. Its totient is φ = 25261824.

The previous prime is 25432619. The next prime is 25432699. The reversal of 25432661 is 16623452.

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 13140625 + 12292036 = 3625^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 25432661 - 2¹⁸ = 25170517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25432261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85196 + ... + 85493.

It is an arithmetic number, because the mean of its divisors is an integer number (6400875).

Almost surely, 2^25432661 is an apocalyptic number.

It is an amenable number.

25432661 is a deficient number, since it is larger than the sum of its proper divisors (170839).

25432661 is a wasteful number, since it uses less digits than its factorization.

25432661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170838.

The product of its digits is 8640, while the sum is 29.

The square root of 25432661 is about 5043.0805069917. The cubic root of 25432661 is about 294.0789466672.

The spelling of 25432661 in words is "twenty-five million, four hundred thirty-two thousand, six hundred sixty-one".