66250666 has 8 divisors (see below), whose sum is σ = 105221700. Its totient is φ = 31176768.

The previous prime is 66250661. The next prime is 66250669. The reversal of 66250666 is 66605266.

66250666 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 2 ways, for example, as 52345225 + 13905441 = 7235^2 + 3729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66250661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974241 + ... + 974308.

Almost surely, 2^66250666 is an apocalyptic number.

66250666 is a deficient number, since it is larger than the sum of its proper divisors (38971034).

66250666 is a wasteful number, since it uses less digits than its factorization.

66250666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948568.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 66250666 is about 8139.4512100018. The cubic root of 66250666 is about 404.6349726281.

The spelling of 66250666 in words is "sixty-six million, two hundred fifty thousand, six hundred sixty-six".