66012217 has 8 divisors (see below), whose sum is σ = 66955392. Its totient is φ = 65076000.

The previous prime is 66012203. The next prime is 66012223. The reversal of 66012217 is 71221066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66012217 is a prime.

It is a super-2 number, since 2×66012217² = 8715225586510178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66012191 and 66012200.

It is not an unprimeable number, because it can be changed into a prime (66012257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19092 + ... + 22282.

It is an arithmetic number, because the mean of its divisors is an integer number (8369424).

Almost surely, 2^66012217 is an apocalyptic number.

It is an amenable number.

66012217 is a deficient number, since it is larger than the sum of its proper divisors (943175).

66012217 is a wasteful number, since it uses less digits than its factorization.

66012217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 66012217 is about 8124.7902742163. The cubic root of 66012217 is about 404.1489357912.

The spelling of 66012217 in words is "sixty-six million, twelve thousand, two hundred seventeen".