66380371 has 2 divisors, whose sum is σ = 66380372. Its totient is φ = 66380370.

The previous prime is 66380351. The next prime is 66380387. The reversal of 66380371 is 17308366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66380371 - 2¹⁷ = 66249299 is a prime.

It is not a weakly prime, because it can be changed into another prime (66380341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33190185 + 33190186.

It is an arithmetic number, because the mean of its divisors is an integer number (33190186).

Almost surely, 2^66380371 is an apocalyptic number.

66380371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66380371 is an equidigital number, since it uses as much as digits as its factorization.

66380371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 66380371 is about 8147.4149888170. The cubic root of 66380371 is about 404.8988641436.

The spelling of 66380371 in words is "sixty-six million, three hundred eighty thousand, three hundred seventy-one".