66738943 has 2 divisors, whose sum is σ = 66738944. Its totient is φ = 66738942.

The previous prime is 66738937. The next prime is 66738979. The reversal of 66738943 is 34983766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66738943 is a prime.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 66738893 and 66738902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66738913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33369471 + 33369472.

It is an arithmetic number, because the mean of its divisors is an integer number (33369472).

Almost surely, 2^66738943 is an apocalyptic number.

66738943 is a deficient number, since it is larger than the sum of its proper divisors (1).

66738943 is an equidigital number, since it uses as much as digits as its factorization.

66738943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 46.

The square root of 66738943 is about 8169.3906137484. The cubic root of 66738943 is about 405.6266132020.

The spelling of 66738943 in words is "sixty-six million, seven hundred thirty-eight thousand, nine hundred forty-three".