666886250 has 20 divisors (see below), whose sum is σ = 1250013930. Its totient is φ = 266754000.

The previous prime is 666886237. The next prime is 666886289. The reversal of 666886250 is 52688666.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1194649 + 665691601 = 1093^2 + 25801^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666886195 and 666886204.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 265505 + ... + 268004.

Almost surely, 2^666886250 is an apocalyptic number.

666886250 is a deficient number, since it is larger than the sum of its proper divisors (583127680).

666886250 is an equidigital number, since it uses as much as digits as its factorization.

666886250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533531 (or 533516 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 666886250 is about 25824.1408375961. The cubic root of 666886250 is about 873.6763660631.

The spelling of 666886250 in words is "six hundred sixty-six million, eight hundred eighty-six thousand, two hundred fifty".