66217363 has 4 divisors (see below), whose sum is σ = 70112520. Its totient is φ = 62322208.

The previous prime is 66217357. The next prime is 66217379. The reversal of 66217363 is 36371266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36371266 = 2 ⋅18185633.

It is a cyclic number.

It is not a de Polignac number, because 66217363 - 2⁹ = 66216851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66217303) 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, 1947553 + ... + 1947586.

It is an arithmetic number, because the mean of its divisors is an integer number (17528130).

Almost surely, 2^66217363 is an apocalyptic number.

66217363 is a deficient number, since it is larger than the sum of its proper divisors (3895157).

66217363 is a wasteful number, since it uses less digits than its factorization.

66217363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895156.

The product of its digits is 27216, while the sum is 34.

The square root of 66217363 is about 8137.4051760988. The cubic root of 66217363 is about 404.5671603936.

The spelling of 66217363 in words is "sixty-six million, two hundred seventeen thousand, three hundred sixty-three".