666921119 has 2 divisors, whose sum is σ = 666921120. Its totient is φ = 666921118.

The previous prime is 666921103. The next prime is 666921139. The reversal of 666921119 is 911129666.

666921119 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 666921119 - 2⁴ = 666921103 is a prime.

It is a super-2 number, since 2×666921119² = 889567557936424322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666921139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333460559 + 333460560.

It is an arithmetic number, because the mean of its divisors is an integer number (333460560).

Almost surely, 2^666921119 is an apocalyptic number.

666921119 is a deficient number, since it is larger than the sum of its proper divisors (1).

666921119 is an equidigital number, since it uses as much as digits as its factorization.

666921119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 41.

The square root of 666921119 is about 25824.8159528776. The cubic root of 666921119 is about 873.6915928929.

The spelling of 666921119 in words is "six hundred sixty-six million, nine hundred twenty-one thousand, one hundred nineteen".