666115893 has 10 divisors (see below), whose sum is σ = 995062134. Its totient is φ = 444077208.

The previous prime is 666115873. The next prime is 666115997. The reversal of 666115893 is 398511666.

It can be written as a sum of positive squares in only one way, i.e., 654234084 + 11881809 = 25578^2 + 3447^2 .

It is not a de Polignac number, because 666115893 - 2¹⁴ = 666099509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666115843) 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 9 ways as a sum of consecutive naturals, for example, 4111746 + ... + 4111907.

Almost surely, 2^666115893 is an apocalyptic number.

It is an amenable number.

666115893 is a deficient number, since it is larger than the sum of its proper divisors (328946241).

666115893 is an equidigital number, since it uses as much as digits as its factorization.

666115893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8223665 (or 8223656 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 666115893 is about 25809.2210847209. The cubic root of 666115893 is about 873.3398258975.

The spelling of 666115893 in words is "six hundred sixty-six million, one hundred fifteen thousand, eight hundred ninety-three".