666849229999 has 2 divisors, whose sum is σ = 666849230000. Its totient is φ = 666849229998.

The previous prime is 666849229987. The next prime is 666849230039. The reversal of 666849229999 is 999922948666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666849229999 - 2²⁵ = 666815675567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666849229099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333424614999 + 333424615000.

It is an arithmetic number, because the mean of its divisors is an integer number (333424615000).

Almost surely, 2^666849229999 is an apocalyptic number.

666849229999 is a deficient number, since it is larger than the sum of its proper divisors (1).

666849229999 is an equidigital number, since it uses as much as digits as its factorization.

666849229999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632586752, while the sum is 79.

The spelling of 666849229999 in words is "six hundred sixty-six billion, eight hundred forty-nine million, two hundred twenty-nine thousand, nine hundred ninety-nine".