666012143 has 2 divisors, whose sum is σ = 666012144. Its totient is φ = 666012142.

The previous prime is 666012101. The next prime is 666012157. The reversal of 666012143 is 341210666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666012143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666012343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333006071 + 333006072.

It is an arithmetic number, because the mean of its divisors is an integer number (333006072).

Almost surely, 2^666012143 is an apocalyptic number.

666012143 is a deficient number, since it is larger than the sum of its proper divisors (1).

666012143 is an equidigital number, since it uses as much as digits as its factorization.

666012143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 666012143 is about 25807.2110659017. The cubic root of 666012143 is about 873.2944815800.

The spelling of 666012143 in words is "six hundred sixty-six million, twelve thousand, one hundred forty-three".