66197701 has 2 divisors, whose sum is σ = 66197702. Its totient is φ = 66197700.

The previous prime is 66197693. The next prime is 66197707. The reversal of 66197701 is 10779166.

66197701 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 can be written as a sum of positive squares in only one way, i.e., 65044225 + 1153476 = 8065^2 + 1074^2 .

It is a cyclic number.

It is not a de Polignac number, because 66197701 - 2³ = 66197693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66197707) 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, 33098850 + 33098851.

It is an arithmetic number, because the mean of its divisors is an integer number (33098851).

Almost surely, 2^66197701 is an apocalyptic number.

It is an amenable number.

66197701 is a deficient number, since it is larger than the sum of its proper divisors (1).

66197701 is an equidigital number, since it uses as much as digits as its factorization.

66197701 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 66197701 is about 8136.1969617260. The cubic root of 66197701 is about 404.5271135610.

The spelling of 66197701 in words is "sixty-six million, one hundred ninety-seven thousand, seven hundred one".