166043623 has 2 divisors, whose sum is σ = 166043624. Its totient is φ = 166043622.

The previous prime is 166043611. The next prime is 166043627. The reversal of 166043623 is 326340661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166043623 is a prime.

It is a super-2 number, since 2×166043623² = 55140969477932258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166043627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83021811 + 83021812.

It is an arithmetic number, because the mean of its divisors is an integer number (83021812).

Almost surely, 2^166043623 is an apocalyptic number.

166043623 is a deficient number, since it is larger than the sum of its proper divisors (1).

166043623 is an equidigital number, since it uses as much as digits as its factorization.

166043623 is an odious number, because the sum of its binary digits is odd.

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

The square root of 166043623 is about 12885.7915162399. The cubic root of 166043623 is about 549.6346035810.

The spelling of 166043623 in words is "one hundred sixty-six million, forty-three thousand, six hundred twenty-three".