66191707 has 2 divisors, whose sum is σ = 66191708. Its totient is φ = 66191706.

The previous prime is 66191701. The next prime is 66191711. The reversal of 66191707 is 70719166.

66191707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66191707 - 2¹¹ = 66189659 is a prime.

It is not a weakly prime, because it can be changed into another prime (66191701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33095853 + 33095854.

It is an arithmetic number, because the mean of its divisors is an integer number (33095854).

Almost surely, 2^66191707 is an apocalyptic number.

66191707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66191707 is an equidigital number, since it uses as much as digits as its factorization.

66191707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 66191707 is about 8135.8285994728. The cubic root of 66191707 is about 404.5149036269.

The spelling of 66191707 in words is "sixty-six million, one hundred ninety-one thousand, seven hundred seven".