66664411 has 4 divisors (see below), whose sum is σ = 72724824. Its totient is φ = 60604000.

The previous prime is 66664391. The next prime is 66664421. The reversal of 66664411 is 11446666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66664411 - 2¹⁷ = 66533339 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66664421) 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 3 ways as a sum of consecutive naturals, for example, 3030190 + ... + 3030211.

It is an arithmetic number, because the mean of its divisors is an integer number (18181206).

Almost surely, 2^66664411 is an apocalyptic number.

66664411 is a deficient number, since it is larger than the sum of its proper divisors (6060413).

66664411 is a wasteful number, since it uses less digits than its factorization.

66664411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060412.

The product of its digits is 20736, while the sum is 34.

The square root of 66664411 is about 8164.8276772997. The cubic root of 66664411 is about 405.4755598465.

The spelling of 66664411 in words is "sixty-six million, six hundred sixty-four thousand, four hundred eleven".