66140519 has 2 divisors, whose sum is σ = 66140520. Its totient is φ = 66140518.

The previous prime is 66140513. The next prime is 66140533. The reversal of 66140519 is 91504166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66140519 is a prime.

It is a super-2 number, since 2×66140519² = 8749136507178722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66140513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33070259 + 33070260.

It is an arithmetic number, because the mean of its divisors is an integer number (33070260).

Almost surely, 2^66140519 is an apocalyptic number.

66140519 is a deficient number, since it is larger than the sum of its proper divisors (1).

66140519 is an equidigital number, since it uses as much as digits as its factorization.

66140519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 66140519 is about 8132.6821528940. The cubic root of 66140519 is about 404.4106022991.

The spelling of 66140519 in words is "sixty-six million, one hundred forty thousand, five hundred nineteen".