66168019 has 2 divisors, whose sum is σ = 66168020. Its totient is φ = 66168018.

The previous prime is 66167993. The next prime is 66168041. The reversal of 66168019 is 91086166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66168019 - 2¹¹ = 66165971 is a prime.

It is a super-2 number, since 2×66168019² = 8756413476768722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66168119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33084009 + 33084010.

It is an arithmetic number, because the mean of its divisors is an integer number (33084010).

Almost surely, 2^66168019 is an apocalyptic number.

66168019 is a deficient number, since it is larger than the sum of its proper divisors (1).

66168019 is an equidigital number, since it uses as much as digits as its factorization.

66168019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 66168019 is about 8134.3726863231. The cubic root of 66168019 is about 404.4666433399.

The spelling of 66168019 in words is "sixty-six million, one hundred sixty-eight thousand, nineteen".