166239673 has 2 divisors, whose sum is σ = 166239674. Its totient is φ = 166239672.

The previous prime is 166239659. The next prime is 166239709. The reversal of 166239673 is 376932661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166100544 + 139129 = 12888^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 166239673 - 2¹⁷ = 166108601 is a prime.

It is not a weakly prime, because it can be changed into another prime (166239643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83119836 + 83119837.

It is an arithmetic number, because the mean of its divisors is an integer number (83119837).

Almost surely, 2^166239673 is an apocalyptic number.

It is an amenable number.

166239673 is a deficient number, since it is larger than the sum of its proper divisors (1).

166239673 is an equidigital number, since it uses as much as digits as its factorization.

166239673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 43.

The square root of 166239673 is about 12893.3964881252. The cubic root of 166239673 is about 549.8508388897.

The spelling of 166239673 in words is "one hundred sixty-six million, two hundred thirty-nine thousand, six hundred seventy-three".