66375943 has 2 divisors, whose sum is σ = 66375944. Its totient is φ = 66375942.

The previous prime is 66375941. The next prime is 66375977. The reversal of 66375943 is 34957366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66375943 - 2¹ = 66375941 is a prime.

Together with 66375941, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66375943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66375941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33187971 + 33187972.

It is an arithmetic number, because the mean of its divisors is an integer number (33187972).

Almost surely, 2^66375943 is an apocalyptic number.

66375943 is a deficient number, since it is larger than the sum of its proper divisors (1).

66375943 is an equidigital number, since it uses as much as digits as its factorization.

66375943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 43.

The square root of 66375943 is about 8147.1432416523. The cubic root of 66375943 is about 404.8898608192.

The spelling of 66375943 in words is "sixty-six million, three hundred seventy-five thousand, nine hundred forty-three".