66166069 has 2 divisors, whose sum is σ = 66166070. Its totient is φ = 66166068.

The previous prime is 66166049. The next prime is 66166073. The reversal of 66166069 is 96066166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66096900 + 69169 = 8130^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 66166069 - 2⁹ = 66165557 is a prime.

It is a super-2 number, since 2×66166069² = 8755897373825522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66166019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083034 + 33083035.

It is an arithmetic number, because the mean of its divisors is an integer number (33083035).

Almost surely, 2^66166069 is an apocalyptic number.

It is an amenable number.

66166069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166069 is an equidigital number, since it uses as much as digits as its factorization.

66166069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 66166069 is about 8134.2528237079. The cubic root of 66166069 is about 404.4626700322.

The spelling of 66166069 in words is "sixty-six million, one hundred sixty-six thousand, sixty-nine".