249563666 has 16 divisors (see below), whose sum is σ = 408620160. Its totient is φ = 113370480.

The previous prime is 249563663. The next prime is 249563669. The reversal of 249563666 is 666365942.

It is an interprime number because it is at equal distance from previous prime (249563663) and next prime (249563669).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 249563666.

It is not an unprimeable number, because it can be changed into a prime (249563663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66800 + ... + 70436.

It is an arithmetic number, because the mean of its divisors is an integer number (25538760).

Almost surely, 2^249563666 is an apocalyptic number.

249563666 is a deficient number, since it is larger than the sum of its proper divisors (159056494).

249563666 is a wasteful number, since it uses less digits than its factorization.

249563666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769.

The product of its digits is 1399680, while the sum is 47.

The square root of 249563666 is about 15797.5841823995. The cubic root of 249563666 is about 629.5938139257.

The spelling of 249563666 in words is "two hundred forty-nine million, five hundred sixty-three thousand, six hundred sixty-six".