207666343460689 has 9 divisors (see below), whose sum is σ = 212608740500649. Its totient is φ = 202836288366180.

The previous prime is 207666343460669. The next prime is 207666343460707. The reversal of 207666343460689 is 986064343666702.

The square root of 207666343460689 is 14410633.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 207666343460689 - 2⁵ = 207666343460657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207666343460669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 619489654 + ... + 619824784.

It is an arithmetic number, because the mean of its divisors is an integer number (23623193388961).

Almost surely, 2^{207666343460689} is an apocalyptic number.

207666343460689 is the 14410633-rd square number.

207666343460689 is the 7205317-th centered octagonal number.

It is an amenable number.

207666343460689 is a deficient number, since it is larger than the sum of its proper divisors (4942397039960).

207666343460689 is an frugal number, since it uses more digits than its factorization.

207666343460689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670348 (or 335174 counting only the distinct ones).

The product of its (nonzero) digits is 1128701952, while the sum is 70.

The spelling of 207666343460689 in words is "two hundred seven trillion, six hundred sixty-six billion, three hundred forty-three million, four hundred sixty thousand, six hundred eighty-nine".