66666594019 has 2 divisors, whose sum is σ = 66666594020. Its totient is φ = 66666594018.

The previous prime is 66666594013. The next prime is 66666594077. The reversal of 66666594019 is 91049566666.

It is an a-pointer prime, because the next prime (66666594077) can be obtained adding 66666594019 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66666594019 - 2³ = 66666594011 is a prime.

It is a super-2 number, since 2×66666594019² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66666594011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333297009 + 33333297010.

It is an arithmetic number, because the mean of its divisors is an integer number (33333297010).

Almost surely, 2^66666594019 is an apocalyptic number.

66666594019 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666594019 is an equidigital number, since it uses as much as digits as its factorization.

66666594019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12597120, while the sum is 58.

The spelling of 66666594019 in words is "sixty-six billion, six hundred sixty-six million, five hundred ninety-four thousand, nineteen".