166500493 has 2 divisors, whose sum is σ = 166500494. Its totient is φ = 166500492.

The previous prime is 166500491. The next prime is 166500527. The reversal of 166500493 is 394005661.

166500493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (166500527) can be obtained adding 166500493 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118309129 + 48191364 = 10877^2 + 6942^2 .

It is a cyclic number.

It is not a de Polignac number, because 166500493 - 2¹ = 166500491 is a prime.

Together with 166500491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166500491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83250246 + 83250247.

It is an arithmetic number, because the mean of its divisors is an integer number (83250247).

Almost surely, 2^166500493 is an apocalyptic number.

It is an amenable number.

166500493 is a deficient number, since it is larger than the sum of its proper divisors (1).

166500493 is an equidigital number, since it uses as much as digits as its factorization.

166500493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 166500493 is about 12903.5070039118. The cubic root of 166500493 is about 550.1382495438.

The spelling of 166500493 in words is "one hundred sixty-six million, five hundred thousand, four hundred ninety-three".