166343939 has 2 divisors, whose sum is σ = 166343940. Its totient is φ = 166343938.

The previous prime is 166343927. The next prime is 166343977. The reversal of 166343939 is 939343661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166343939 - 2¹⁶ = 166278403 is a prime.

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 166343939.

It is not a weakly prime, because it can be changed into another prime (166343339) 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, 83171969 + 83171970.

It is an arithmetic number, because the mean of its divisors is an integer number (83171970).

Almost surely, 2^166343939 is an apocalyptic number.

166343939 is a deficient number, since it is larger than the sum of its proper divisors (1).

166343939 is an equidigital number, since it uses as much as digits as its factorization.

166343939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 44.

The square root of 166343939 is about 12897.4392419581. The cubic root of 166343939 is about 549.9657708726.

The spelling of 166343939 in words is "one hundred sixty-six million, three hundred forty-three thousand, nine hundred thirty-nine".