666089901 has 12 divisors (see below), whose sum is σ = 993166720. Its totient is φ = 429735240.

The previous prime is 666089891. The next prime is 666089923. The reversal of 666089901 is 109980666.

It is a de Polignac number, because none of the positive numbers 2^k-666089901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666089101) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1193431 + ... + 1193988.

Almost surely, 2^666089901 is an apocalyptic number.

It is an amenable number.

666089901 is a deficient number, since it is larger than the sum of its proper divisors (327076819).

666089901 is a wasteful number, since it uses less digits than its factorization.

666089901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387456 (or 2387453 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 666089901 is about 25808.7175388472. The cubic root of 666089901 is about 873.3284664408.

The spelling of 666089901 in words is "six hundred sixty-six million, eighty-nine thousand, nine hundred one".