66239387 has 2 divisors, whose sum is σ = 66239388. Its totient is φ = 66239386.

The previous prime is 66239323. The next prime is 66239401. The reversal of 66239387 is 78393266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66239387 - 2⁶ = 66239323 is a prime.

It is not a weakly prime, because it can be changed into another prime (66239317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33119693 + 33119694.

It is an arithmetic number, because the mean of its divisors is an integer number (33119694).

Almost surely, 2^66239387 is an apocalyptic number.

66239387 is a deficient number, since it is larger than the sum of its proper divisors (1).

66239387 is an equidigital number, since it uses as much as digits as its factorization.

66239387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 44.

The square root of 66239387 is about 8138.7583205302. The cubic root of 66239387 is about 404.6120086483.

The spelling of 66239387 in words is "sixty-six million, two hundred thirty-nine thousand, three hundred eighty-seven".