66654843043 has 2 divisors, whose sum is σ = 66654843044. Its totient is φ = 66654843042.

The previous prime is 66654843011. The next prime is 66654843109. The reversal of 66654843043 is 34034845666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66654843043 - 2⁵ = 66654843011 is a prime.

It is not a weakly prime, because it can be changed into another prime (66654243043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327421521 + 33327421522.

It is an arithmetic number, because the mean of its divisors is an integer number (33327421522).

Almost surely, 2^66654843043 is an apocalyptic number.

66654843043 is a deficient number, since it is larger than the sum of its proper divisors (1).

66654843043 is an equidigital number, since it uses as much as digits as its factorization.

66654843043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 49.

The spelling of 66654843043 in words is "sixty-six billion, six hundred fifty-four million, eight hundred forty-three thousand, forty-three".