66518443 has 2 divisors, whose sum is σ = 66518444. Its totient is φ = 66518442.

The previous prime is 66518423. The next prime is 66518453. The reversal of 66518443 is 34481566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66518443 - 2⁹ = 66517931 is a prime.

It is not a weakly prime, because it can be changed into another prime (66518423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33259221 + 33259222.

It is an arithmetic number, because the mean of its divisors is an integer number (33259222).

Almost surely, 2^66518443 is an apocalyptic number.

66518443 is a deficient number, since it is larger than the sum of its proper divisors (1).

66518443 is an equidigital number, since it uses as much as digits as its factorization.

66518443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 37.

The square root of 66518443 is about 8155.8839496403. The cubic root of 66518443 is about 405.1794012898.

The spelling of 66518443 in words is "sixty-six million, five hundred eighteen thousand, four hundred forty-three".