666640301699 has 2 divisors, whose sum is σ = 666640301700. Its totient is φ = 666640301698.

The previous prime is 666640301693. The next prime is 666640301759. The reversal of 666640301699 is 996103046666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666640301699 is a prime.

It is not a weakly prime, because it can be changed into another prime (666640301693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333320150849 + 333320150850.

It is an arithmetic number, because the mean of its divisors is an integer number (333320150850).

Almost surely, 2^666640301699 is an apocalyptic number.

666640301699 is a deficient number, since it is larger than the sum of its proper divisors (1).

666640301699 is an equidigital number, since it uses as much as digits as its factorization.

666640301699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 56.

The spelling of 666640301699 in words is "six hundred sixty-six billion, six hundred forty million, three hundred one thousand, six hundred ninety-nine".