166663741 has 2 divisors, whose sum is σ = 166663742. Its totient is φ = 166663740.

The previous prime is 166663723. The next prime is 166663769. The reversal of 166663741 is 147366661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142898116 + 23765625 = 11954^2 + 4875^2 .

It is a cyclic number.

It is not a de Polignac number, because 166663741 - 2⁹ = 166663229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166663694 and 166663703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166667741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83331870 + 83331871.

It is an arithmetic number, because the mean of its divisors is an integer number (83331871).

Almost surely, 2^166663741 is an apocalyptic number.

It is an amenable number.

166663741 is a deficient number, since it is larger than the sum of its proper divisors (1).

166663741 is an equidigital number, since it uses as much as digits as its factorization.

166663741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 166663741 is about 12909.8311762780. The cubic root of 166663741 is about 550.3179880174.

The spelling of 166663741 in words is "one hundred sixty-six million, six hundred sixty-three thousand, seven hundred forty-one".