66001699 has 2 divisors, whose sum is σ = 66001700. Its totient is φ = 66001698.

The previous prime is 66001681. The next prime is 66001711. The reversal of 66001699 is 99610066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66001699 - 2¹⁷ = 65870627 is a prime.

It is not a weakly prime, because it can be changed into another prime (66001609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000849 + 33000850.

It is an arithmetic number, because the mean of its divisors is an integer number (33000850).

Almost surely, 2^66001699 is an apocalyptic number.

66001699 is a deficient number, since it is larger than the sum of its proper divisors (1).

66001699 is an equidigital number, since it uses as much as digits as its factorization.

66001699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 66001699 is about 8124.1429701846. The cubic root of 66001699 is about 404.1274697430.

The spelling of 66001699 in words is "sixty-six million, one thousand, six hundred ninety-nine".