25449661 has 6 divisors (see below), whose sum is σ = 26604830. Its totient is φ = 24342648.

The previous prime is 25449659. The next prime is 25449719. The reversal of 25449661 is 16694452.

It can be written as a sum of positive squares in only one way, i.e., 22231225 + 3218436 = 4715^2 + 1794^2 .

It is not a de Polignac number, because 25449661 - 2¹ = 25449659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25449661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25449601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23526 + ... + 24583.

Almost surely, 2^25449661 is an apocalyptic number.

It is an amenable number.

25449661 is a deficient number, since it is larger than the sum of its proper divisors (1155169).

25449661 is an equidigital number, since it uses as much as digits as its factorization.

25449661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48155 (or 48132 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 25449661 is about 5044.7657031819. The cubic root of 25449661 is about 294.1444559822.

The spelling of 25449661 in words is "twenty-five million, four hundred forty-nine thousand, six hundred sixty-one".