25966642 has 8 divisors (see below), whose sum is σ = 41946156. Its totient is φ = 11984592.

The previous prime is 25966639. The next prime is 25966643. The reversal of 25966642 is 24666952.

It can be written as a sum of positive squares in 2 ways, for example, as 20439441 + 5527201 = 4521^2 + 2351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 25966595 and 25966604.

It is not an unprimeable number, because it can be changed into a prime (25966643) 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, 499333 + ... + 499384.

Almost surely, 2^25966642 is an apocalyptic number.

25966642 is a deficient number, since it is larger than the sum of its proper divisors (15979514).

25966642 is a wasteful number, since it uses less digits than its factorization.

25966642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998732.

The product of its digits is 155520, while the sum is 40.

The square root of 25966642 is about 5095.7474427212. The cubic root of 25966642 is about 296.1228565365.

Adding to 25966642 its product of digits (155520), we get a palindrome (26122162).

The spelling of 25966642 in words is "twenty-five million, nine hundred sixty-six thousand, six hundred forty-two".