166101281 has 2 divisors, whose sum is σ = 166101282. Its totient is φ = 166101280.

The previous prime is 166101277. The next prime is 166101283. The reversal of 166101281 is 182101661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164891281 + 1210000 = 12841^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 166101281 - 2² = 166101277 is a prime.

It is a super-2 number, since 2×166101281² = 55179271099681922, which contains 22 as substring.

Together with 166101283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166101281.

It is not a weakly prime, because it can be changed into another prime (166101283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83050640 + 83050641.

It is an arithmetic number, because the mean of its divisors is an integer number (83050641).

Almost surely, 2^166101281 is an apocalyptic number.

It is an amenable number.

166101281 is a deficient number, since it is larger than the sum of its proper divisors (1).

166101281 is an equidigital number, since it uses as much as digits as its factorization.

166101281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 166101281 is about 12888.0285924574. The cubic root of 166101281 is about 549.6982157089.

The spelling of 166101281 in words is "one hundred sixty-six million, one hundred one thousand, two hundred eighty-one".