666005699 has 2 divisors, whose sum is σ = 666005700. Its totient is φ = 666005698.

The previous prime is 666005693. The next prime is 666005707. The reversal of 666005699 is 996500666.

It is a happy number.

666005699 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666005699 - 2¹² = 666001603 is a prime.

It is a super-2 number, since 2×666005699² = 887127182200957202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666005693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333002849 + 333002850.

It is an arithmetic number, because the mean of its divisors is an integer number (333002850).

Almost surely, 2^666005699 is an apocalyptic number.

666005699 is a deficient number, since it is larger than the sum of its proper divisors (1).

666005699 is an equidigital number, since it uses as much as digits as its factorization.

666005699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 666005699 is about 25807.0862167739. The cubic root of 666005699 is about 873.2916650509.

The spelling of 666005699 in words is "six hundred sixty-six million, five thousand, six hundred ninety-nine".