66380687 has 2 divisors, whose sum is σ = 66380688. Its totient is φ = 66380686.

The previous prime is 66380683. The next prime is 66380693. The reversal of 66380687 is 78608366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66380687 - 2² = 66380683 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66380683) 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, 33190343 + 33190344.

It is an arithmetic number, because the mean of its divisors is an integer number (33190344).

Almost surely, 2^66380687 is an apocalyptic number.

66380687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66380687 is an equidigital number, since it uses as much as digits as its factorization.

66380687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66380687 is about 8147.4343814479. The cubic root of 66380687 is about 404.8995066419.

The spelling of 66380687 in words is "sixty-six million, three hundred eighty thousand, six hundred eighty-seven".