166023643 has 2 divisors, whose sum is σ = 166023644. Its totient is φ = 166023642.

The previous prime is 166023623. The next prime is 166023647. The reversal of 166023643 is 346320661.

It is a strong prime.

It is an emirp because it is prime and its reverse (346320661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166023643 - 2²¹ = 163926491 is a prime.

It is not a weakly prime, because it can be changed into another prime (166023647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83011821 + 83011822.

It is an arithmetic number, because the mean of its divisors is an integer number (83011822).

Almost surely, 2^166023643 is an apocalyptic number.

166023643 is a deficient number, since it is larger than the sum of its proper divisors (1).

166023643 is an equidigital number, since it uses as much as digits as its factorization.

166023643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 166023643 is about 12885.0162204011. The cubic root of 166023643 is about 549.6125568849.

The spelling of 166023643 in words is "one hundred sixty-six million, twenty-three thousand, six hundred forty-three".