166765493 has 4 divisors (see below), whose sum is σ = 167457708. Its totient is φ = 166073280.

The previous prime is 166765483. The next prime is 166765499. The reversal of 166765493 is 394567661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104387089 + 62378404 = 10217^2 + 7898^2 .

It is a cyclic number.

It is not a de Polignac number, because 166765493 - 2⁶ = 166765429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166765499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345746 + ... + 346227.

It is an arithmetic number, because the mean of its divisors is an integer number (41864427).

Almost surely, 2^166765493 is an apocalyptic number.

It is an amenable number.

166765493 is a deficient number, since it is larger than the sum of its proper divisors (692215).

166765493 is an equidigital number, since it uses as much as digits as its factorization.

166765493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692214.

The product of its digits is 816480, while the sum is 47.

The square root of 166765493 is about 12913.7714475671. The cubic root of 166765493 is about 550.4299591113.

The spelling of 166765493 in words is "one hundred sixty-six million, seven hundred sixty-five thousand, four hundred ninety-three".