66164243 has 2 divisors, whose sum is σ = 66164244. Its totient is φ = 66164242.

The previous prime is 66164239. The next prime is 66164257. The reversal of 66164243 is 34246166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66164243 - 2² = 66164239 is a prime.

It is not a weakly prime, because it can be changed into another prime (66164543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082121 + 33082122.

It is an arithmetic number, because the mean of its divisors is an integer number (33082122).

Almost surely, 2^66164243 is an apocalyptic number.

66164243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164243 is an equidigital number, since it uses as much as digits as its factorization.

66164243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 66164243 is about 8134.1405815243. The cubic root of 66164243 is about 404.4589493153.

The spelling of 66164243 in words is "sixty-six million, one hundred sixty-four thousand, two hundred forty-three".