25146661 has 4 divisors (see below), whose sum is σ = 25218252. Its totient is φ = 25075072.

The previous prime is 25146647. The next prime is 25146691. The reversal of 25146661 is 16664152.

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 4950625 + 20196036 = 2225^2 + 4494^2 .

It is a cyclic number.

It is not a de Polignac number, because 25146661 - 2¹⁹ = 24622373 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25146601) 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, 35266 + ... + 35971.

It is an arithmetic number, because the mean of its divisors is an integer number (6304563).

Almost surely, 2^25146661 is an apocalyptic number.

It is an amenable number.

25146661 is a deficient number, since it is larger than the sum of its proper divisors (71591).

25146661 is an equidigital number, since it uses as much as digits as its factorization.

25146661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71590.

The product of its digits is 8640, while the sum is 31.

The square root of 25146661 is about 5014.6446534126. The cubic root of 25146661 is about 292.9724451561.

The spelling of 25146661 in words is "twenty-five million, one hundred forty-six thousand, six hundred sixty-one".