66166223 has 2 divisors, whose sum is σ = 66166224. Its totient is φ = 66166222.

The previous prime is 66166201. The next prime is 66166229. The reversal of 66166223 is 32266166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66166223 - 2¹⁶ = 66100687 is a prime.

It is equal to p_3905375 and since 66166223 and 3905375 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66166223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66166229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083111 + 33083112.

It is an arithmetic number, because the mean of its divisors is an integer number (33083112).

Almost surely, 2^66166223 is an apocalyptic number.

66166223 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166223 is an equidigital number, since it uses as much as digits as its factorization.

66166223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 66166223 is about 8134.2622898453. The cubic root of 66166223 is about 404.4629838245.

The spelling of 66166223 in words is "sixty-six million, one hundred sixty-six thousand, two hundred twenty-three".