66216343 has 4 divisors (see below), whose sum is σ = 70111440. Its totient is φ = 62321248.

The previous prime is 66216323. The next prime is 66216361. The reversal of 66216343 is 34361266.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66216343 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 (66216323) 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, 1947523 + ... + 1947556.

It is an arithmetic number, because the mean of its divisors is an integer number (17527860).

Almost surely, 2^66216343 is an apocalyptic number.

66216343 is a deficient number, since it is larger than the sum of its proper divisors (3895097).

66216343 is a wasteful number, since it uses less digits than its factorization.

66216343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895096.

The product of its digits is 15552, while the sum is 31.

The square root of 66216343 is about 8137.3425023161. The cubic root of 66216343 is about 404.5650830904.

The spelling of 66216343 in words is "sixty-six million, two hundred sixteen thousand, three hundred forty-three".