66226217 has 6 divisors (see below), whose sum is σ = 67233978. Its totient is φ = 65233344.

The previous prime is 66226207. The next prime is 66226231. The reversal of 66226217 is 71262266.

It can be written as a sum of positive squares in only one way, i.e., 56310016 + 9916201 = 7504^2 + 3149^2 .

It is not a de Polignac number, because 66226217 - 2⁴ = 66226201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66226207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2888 + ... + 11865.

It is an arithmetic number, because the mean of its divisors is an integer number (11205663).

Almost surely, 2^66226217 is an apocalyptic number.

66226217 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66226217 is a deficient number, since it is larger than the sum of its proper divisors (1007761).

66226217 is an equidigital number, since it uses as much as digits as its factorization.

66226217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14887 (or 14820 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 66226217 is about 8137.9491888313. The cubic root of 66226217 is about 404.5851913039.

The spelling of 66226217 in words is "sixty-six million, two hundred twenty-six thousand, two hundred seventeen".