25661442 has 24 divisors (see below), whose sum is σ = 52171056. Its totient is φ = 8413528.

The previous prime is 25661429. The next prime is 25661443. The reversal of 25661442 is 24416652.

It is not an unprimeable number, because it can be changed into a prime (25661443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112933 + ... + 113159.

It is an arithmetic number, because the mean of its divisors is an integer number (2173794).

Almost surely, 2^25661442 is an apocalyptic number.

25661442 is an abundant number, since it is smaller than the sum of its proper divisors (26509614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25661442 is an equidigital number, since it uses as much as digits as its factorization.

25661442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 315 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 25661442 is about 5065.7123882037. The cubic root of 25661442 is about 294.9581171986.

The spelling of 25661442 in words is "twenty-five million, six hundred sixty-one thousand, four hundred forty-two".