660066250 has 20 divisors (see below), whose sum is σ = 1237230522. Its totient is φ = 264026000.

The previous prime is 660066247. The next prime is 660066263. The reversal of 660066250 is 52660066.

It can be written as a sum of positive squares in 5 ways, for example, as 5678689 + 654387561 = 2383^2 + 25581^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 262777 + ... + 265276.

Almost surely, 2^660066250 is an apocalyptic number.

660066250 is a deficient number, since it is larger than the sum of its proper divisors (577164272).

660066250 is an equidigital number, since it uses as much as digits as its factorization.

660066250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528075 (or 528060 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 660066250 is about 25691.7545138513. The cubic root of 660066250 is about 870.6879000333.

The spelling of 660066250 in words is "six hundred sixty million, sixty-six thousand, two hundred fifty".