66343457 has 2 divisors, whose sum is σ = 66343458. Its totient is φ = 66343456.

The previous prime is 66343451. The next prime is 66343499. The reversal of 66343457 is 75434366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43771456 + 22572001 = 6616^2 + 4751^2 .

It is a cyclic number.

It is not a de Polignac number, because 66343457 - 2⁶ = 66343393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66343457.

It is not a weakly prime, because it can be changed into another prime (66343451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33171728 + 33171729.

It is an arithmetic number, because the mean of its divisors is an integer number (33171729).

Almost surely, 2^66343457 is an apocalyptic number.

It is an amenable number.

66343457 is a deficient number, since it is larger than the sum of its proper divisors (1).

66343457 is an equidigital number, since it uses as much as digits as its factorization.

66343457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 38.

The square root of 66343457 is about 8145.1492926772. The cubic root of 66343457 is about 404.8237957267.

Subtracting 66343457 from its reverse (75434366), we obtain a palindrome (9090909).

The spelling of 66343457 in words is "sixty-six million, three hundred forty-three thousand, four hundred fifty-seven".