66628943 has 2 divisors, whose sum is σ = 66628944. Its totient is φ = 66628942.

The previous prime is 66628937. The next prime is 66628987. The reversal of 66628943 is 34982666.

It is an a-pointer prime, because the next prime (66628987) can be obtained adding 66628943 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66628943 - 2²² = 62434639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66628894 and 66628903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66628343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33314471 + 33314472.

It is an arithmetic number, because the mean of its divisors is an integer number (33314472).

Almost surely, 2^66628943 is an apocalyptic number.

66628943 is a deficient number, since it is larger than the sum of its proper divisors (1).

66628943 is an equidigital number, since it uses as much as digits as its factorization.

66628943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 44.

The square root of 66628943 is about 8162.6553890263. The cubic root of 66628943 is about 405.4036376211.

The spelling of 66628943 in words is "sixty-six million, six hundred twenty-eight thousand, nine hundred forty-three".