166635493 has 2 divisors, whose sum is σ = 166635494. Its totient is φ = 166635492.

The previous prime is 166635481. The next prime is 166635517. The reversal of 166635493 is 394536661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166461604 + 173889 = 12902^2 + 417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166635493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166635463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83317746 + 83317747.

It is an arithmetic number, because the mean of its divisors is an integer number (83317747).

Almost surely, 2^166635493 is an apocalyptic number.

It is an amenable number.

166635493 is a deficient number, since it is larger than the sum of its proper divisors (1).

166635493 is an equidigital number, since it uses as much as digits as its factorization.

166635493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 43.

The square root of 166635493 is about 12908.7370799780. The cubic root of 166635493 is about 550.2868949499.

The spelling of 166635493 in words is "one hundred sixty-six million, six hundred thirty-five thousand, four hundred ninety-three".