166542917 has 2 divisors, whose sum is σ = 166542918. Its totient is φ = 166542916.

The previous prime is 166542877. The next prime is 166542967. The reversal of 166542917 is 719245661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154529761 + 12013156 = 12431^2 + 3466^2 .

It is an emirp because it is prime and its reverse (719245661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166542917 - 2¹⁴ = 166526533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166542967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83271458 + 83271459.

It is an arithmetic number, because the mean of its divisors is an integer number (83271459).

Almost surely, 2^166542917 is an apocalyptic number.

It is an amenable number.

166542917 is a deficient number, since it is larger than the sum of its proper divisors (1).

166542917 is an equidigital number, since it uses as much as digits as its factorization.

166542917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 166542917 is about 12905.1507933848. The cubic root of 166542917 is about 550.1849702926.

The spelling of 166542917 in words is "one hundred sixty-six million, five hundred forty-two thousand, nine hundred seventeen".