166200806281 has 2 divisors, whose sum is σ = 166200806282. Its totient is φ = 166200806280.

The previous prime is 166200806267. The next prime is 166200806311. The reversal of 166200806281 is 182608002661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156495404025 + 9705402256 = 395595^2 + 98516^2 .

It is a cyclic number.

It is not a de Polignac number, because 166200806281 - 2⁹ = 166200805769 is a prime.

It is a super-2 number, since 2×166200806281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166200804281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83100403140 + 83100403141.

It is an arithmetic number, because the mean of its divisors is an integer number (83100403141).

Almost surely, 2^166200806281 is an apocalyptic number.

It is an amenable number.

166200806281 is a deficient number, since it is larger than the sum of its proper divisors (1).

166200806281 is an equidigital number, since it uses as much as digits as its factorization.

166200806281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 166200806281 in words is "one hundred sixty-six billion, two hundred million, eight hundred six thousand, two hundred eighty-one".