666141643 has 2 divisors, whose sum is σ = 666141644. Its totient is φ = 666141642.

The previous prime is 666141631. The next prime is 666141727. The reversal of 666141643 is 346141666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666141643 - 2⁵ = 666141611 is a prime.

It is not a weakly prime, because it can be changed into another prime (666141043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070821 + 333070822.

It is an arithmetic number, because the mean of its divisors is an integer number (333070822).

Almost surely, 2^666141643 is an apocalyptic number.

666141643 is a deficient number, since it is larger than the sum of its proper divisors (1).

666141643 is an equidigital number, since it uses as much as digits as its factorization.

666141643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 666141643 is about 25809.7199326145. The cubic root of 666141643 is about 873.3510793000.

The spelling of 666141643 in words is "six hundred sixty-six million, one hundred forty-one thousand, six hundred forty-three".