66315943 has 2 divisors, whose sum is σ = 66315944. Its totient is φ = 66315942.

The previous prime is 66315911. The next prime is 66315973. The reversal of 66315943 is 34951366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66315943 - 2⁵ = 66315911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66315973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157971 + 33157972.

It is an arithmetic number, because the mean of its divisors is an integer number (33157972).

Almost surely, 2^66315943 is an apocalyptic number.

66315943 is a deficient number, since it is larger than the sum of its proper divisors (1).

66315943 is an equidigital number, since it uses as much as digits as its factorization.

66315943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 37.

The square root of 66315943 is about 8143.4601368214. The cubic root of 66315943 is about 404.7678250626.

The spelling of 66315943 in words is "sixty-six million, three hundred fifteen thousand, nine hundred forty-three".