25566642 has 12 divisors (see below), whose sum is σ = 55394430. Its totient is φ = 8522208.

The previous prime is 25566641. The next prime is 25566649. The reversal of 25566642 is 24666552.

It can be written as a sum of positive squares in only one way, i.e., 14814801 + 10751841 = 3849^2 + 3279^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25566597 and 25566606.

It is not an unprimeable number, because it can be changed into a prime (25566641) 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, 710167 + ... + 710202.

Almost surely, 2^25566642 is an apocalyptic number.

25566642 is an abundant number, since it is smaller than the sum of its proper divisors (29827788).

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

25566642 is a wasteful number, since it uses less digits than its factorization.

25566642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420377 (or 1420374 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 25566642 is about 5056.3467048849. The cubic root of 25566642 is about 294.5944518294.

The spelling of 25566642 in words is "twenty-five million, five hundred sixty-six thousand, six hundred forty-two".