66519143 has 2 divisors, whose sum is σ = 66519144. Its totient is φ = 66519142.

The previous prime is 66519121. The next prime is 66519157. The reversal of 66519143 is 34191566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66519143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66519043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33259571 + 33259572.

It is an arithmetic number, because the mean of its divisors is an integer number (33259572).

Almost surely, 2^66519143 is an apocalyptic number.

66519143 is a deficient number, since it is larger than the sum of its proper divisors (1).

66519143 is an equidigital number, since it uses as much as digits as its factorization.

66519143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 66519143 is about 8155.9268633307. The cubic root of 66519143 is about 405.1808225727.

The spelling of 66519143 in words is "sixty-six million, five hundred nineteen thousand, one hundred forty-three".