66343889 has 4 divisors (see below), whose sum is σ = 66789300. Its totient is φ = 65898480.

The previous prime is 66343873. The next prime is 66343903. The reversal of 66343889 is 98834366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4060225 + 62283664 = 2015^2 + 7892^2 .

It is a cyclic number.

It is not a de Polignac number, because 66343889 - 2⁴ = 66343873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66343859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222482 + ... + 222779.

It is an arithmetic number, because the mean of its divisors is an integer number (16697325).

Almost surely, 2^66343889 is an apocalyptic number.

It is an amenable number.

66343889 is a deficient number, since it is larger than the sum of its proper divisors (445411).

66343889 is a wasteful number, since it uses less digits than its factorization.

66343889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445410.

The product of its digits is 746496, while the sum is 47.

The square root of 66343889 is about 8145.1758114850. The cubic root of 66343889 is about 404.8246744042.

The spelling of 66343889 in words is "sixty-six million, three hundred forty-three thousand, eight hundred eighty-nine".