66740519 has 2 divisors, whose sum is σ = 66740520. Its totient is φ = 66740518.

The previous prime is 66740437. The next prime is 66740539. The reversal of 66740519 is 91504766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66740519 - 2⁸ = 66740263 is a prime.

It is a super-2 number, since 2×66740519² = 8908593752778722, which contains 22 as substring.

It is equal to p_3937394 and since 66740519 and 3937394 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66740539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33370259 + 33370260.

It is an arithmetic number, because the mean of its divisors is an integer number (33370260).

Almost surely, 2^66740519 is an apocalyptic number.

66740519 is a deficient number, since it is larger than the sum of its proper divisors (1).

66740519 is an equidigital number, since it uses as much as digits as its factorization.

66740519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 66740519 is about 8169.4870708019. The cubic root of 66740519 is about 405.6298060530.

The spelling of 66740519 in words is "sixty-six million, seven hundred forty thousand, five hundred nineteen".