66519023 has 2 divisors, whose sum is σ = 66519024. Its totient is φ = 66519022.

The previous prime is 66518989. The next prime is 66519043. The reversal of 66519023 is 32091566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66519023 - 2²⁴ = 49741807 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33259511 + 33259512.

It is an arithmetic number, because the mean of its divisors is an integer number (33259512).

Almost surely, 2^66519023 is an apocalyptic number.

66519023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66519023 is an equidigital number, since it uses as much as digits as its factorization.

66519023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 66519023 is about 8155.9195067141. The cubic root of 66519023 is about 405.1805789249.

The spelling of 66519023 in words is "sixty-six million, five hundred nineteen thousand, twenty-three".