66380387 has 2 divisors, whose sum is σ = 66380388. Its totient is φ = 66380386.

The previous prime is 66380371. The next prime is 66380399. The reversal of 66380387 is 78308366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66380387 - 2⁴ = 66380371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66380687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33190193 + 33190194.

It is an arithmetic number, because the mean of its divisors is an integer number (33190194).

Almost surely, 2^66380387 is an apocalyptic number.

66380387 is a deficient number, since it is larger than the sum of its proper divisors (1).

66380387 is an equidigital number, since it uses as much as digits as its factorization.

66380387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 66380387 is about 8147.4159707235. The cubic root of 66380387 is about 404.8988966752.

The spelling of 66380387 in words is "sixty-six million, three hundred eighty thousand, three hundred eighty-seven".