166443677 has 2 divisors, whose sum is σ = 166443678. Its totient is φ = 166443676.

The previous prime is 166443671. The next prime is 166443713. The reversal of 166443677 is 776344661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159415876 + 7027801 = 12626^2 + 2651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166443677 is a prime.

It is a super-2 number, since 2×166443677² = 55406995226560658, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166443671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83221838 + 83221839.

It is an arithmetic number, because the mean of its divisors is an integer number (83221839).

Almost surely, 2^166443677 is an apocalyptic number.

It is an amenable number.

166443677 is a deficient number, since it is larger than the sum of its proper divisors (1).

166443677 is an equidigital number, since it uses as much as digits as its factorization.

166443677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 44.

The square root of 166443677 is about 12901.3052440441. The cubic root of 166443677 is about 550.0756667246.

The spelling of 166443677 in words is "one hundred sixty-six million, four hundred forty-three thousand, six hundred seventy-seven".