25566666 has 32 divisors (see below), whose sum is σ = 54250560. Its totient is φ = 8009856.

The previous prime is 25566649. The next prime is 25566677. The reversal of 25566666 is 66666552.

25566666 is a modest number, since divided by 6666 gives 2556 as remainder.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14800 + ... + 16436.

It is an arithmetic number, because the mean of its divisors is an integer number (1695330).

Almost surely, 2^25566666 is an apocalyptic number.

25566666 is an abundant number, since it is smaller than the sum of its proper divisors (28683894).

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

25566666 is a wasteful number, since it uses less digits than its factorization.

25566666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798.

The product of its digits is 388800, while the sum is 42.

The square root of 25566666 is about 5056.3490781393. The cubic root of 25566666 is about 294.5945440102.

The spelling of 25566666 in words is "twenty-five million, five hundred sixty-six thousand, six hundred sixty-six".