66228199 has 4 divisors (see below), whose sum is σ = 68511960. Its totient is φ = 63944440.

The previous prime is 66228191. The next prime is 66228221. The reversal of 66228199 is 99182266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99182266 = 2 ⋅49591133.

It is a cyclic number.

It is not a de Polignac number, because 66228199 - 2³ = 66228191 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 (66228191) 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, 1141837 + ... + 1141894.

It is an arithmetic number, because the mean of its divisors is an integer number (17127990).

Almost surely, 2^66228199 is an apocalyptic number.

66228199 is a deficient number, since it is larger than the sum of its proper divisors (2283761).

66228199 is a wasteful number, since it uses less digits than its factorization.

66228199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283760.

The product of its digits is 93312, while the sum is 43.

The square root of 66228199 is about 8138.0709630723. The cubic root of 66228199 is about 404.5892273684.

The spelling of 66228199 in words is "sixty-six million, two hundred twenty-eight thousand, one hundred ninety-nine".