66366919 has 2 divisors, whose sum is σ = 66366920. Its totient is φ = 66366918.

The previous prime is 66366893. The next prime is 66366941. The reversal of 66366919 is 91966366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66366919 - 2¹³ = 66358727 is a prime.

It is a super-2 number, since 2×66366919² = 8809135875105122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66366959) 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, 33183459 + 33183460.

It is an arithmetic number, because the mean of its divisors is an integer number (33183460).

Almost surely, 2^66366919 is an apocalyptic number.

66366919 is a deficient number, since it is larger than the sum of its proper divisors (1).

66366919 is an equidigital number, since it uses as much as digits as its factorization.

66366919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 66366919 is about 8146.5894090717. The cubic root of 66366919 is about 404.8715113413.

The spelling of 66366919 in words is "sixty-six million, three hundred sixty-six thousand, nine hundred nineteen".