66030919 has 2 divisors, whose sum is σ = 66030920. Its totient is φ = 66030918.

The previous prime is 66030917. The next prime is 66030949. The reversal of 66030919 is 91903066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66030919 - 2¹ = 66030917 is a prime.

It is a super-2 number, since 2×66030919² = 8720164527969122, which contains 22 as substring.

Together with 66030917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66030917) 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, 33015459 + 33015460.

It is an arithmetic number, because the mean of its divisors is an integer number (33015460).

Almost surely, 2^66030919 is an apocalyptic number.

66030919 is a deficient number, since it is larger than the sum of its proper divisors (1).

66030919 is an equidigital number, since it uses as much as digits as its factorization.

66030919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 66030919 is about 8125.9411147263. The cubic root of 66030919 is about 404.1870988265.

The spelling of 66030919 in words is "sixty-six million, thirty thousand, nine hundred nineteen".