66000989 has 2 divisors, whose sum is σ = 66000990. Its totient is φ = 66000988.

The previous prime is 66000973. The next prime is 66000997. The reversal of 66000989 is 98900066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45225625 + 20775364 = 6725^2 + 4558^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000989 - 2⁴ = 66000973 is a prime.

It is a super-3 number, since 3×66000989³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66000929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000494 + 33000495.

It is an arithmetic number, because the mean of its divisors is an integer number (33000495).

Almost surely, 2^66000989 is an apocalyptic number.

It is an amenable number.

66000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000989 is an equidigital number, since it uses as much as digits as its factorization.

66000989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 66000989 is about 8124.0992731502. The cubic root of 66000989 is about 404.1260206311.

The spelling of 66000989 in words is "sixty-six million, nine hundred eighty-nine", and thus it is an aban number.