25145661 has 4 divisors (see below), whose sum is σ = 33527552. Its totient is φ = 16763772.

The previous prime is 25145657. The next prime is 25145663. The reversal of 25145661 is 16654152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25145661 - 2² = 25145657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25145663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4190941 + ... + 4190946.

It is an arithmetic number, because the mean of its divisors is an integer number (8381888).

Almost surely, 2^25145661 is an apocalyptic number.

It is an amenable number.

25145661 is a deficient number, since it is larger than the sum of its proper divisors (8381891).

25145661 is an equidigital number, since it uses as much as digits as its factorization.

25145661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381890.

The product of its digits is 7200, while the sum is 30.

The square root of 25145661 is about 5014.5449444591. The cubic root of 25145661 is about 292.9685615878.

The spelling of 25145661 in words is "twenty-five million, one hundred forty-five thousand, six hundred sixty-one".