66205856207 has 2 divisors, whose sum is σ = 66205856208. Its totient is φ = 66205856206.

The previous prime is 66205856183. The next prime is 66205856237. The reversal of 66205856207 is 70265850266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66205856207 - 2²⁸ = 65937420751 is a prime.

It is a super-2 number, since 2×66205856207² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66205856237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33102928103 + 33102928104.

It is an arithmetic number, because the mean of its divisors is an integer number (33102928104).

Almost surely, 2^66205856207 is an apocalyptic number.

66205856207 is a deficient number, since it is larger than the sum of its proper divisors (1).

66205856207 is an equidigital number, since it uses as much as digits as its factorization.

66205856207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 66205856207 in words is "sixty-six billion, two hundred five million, eight hundred fifty-six thousand, two hundred seven".