166913503 has 4 divisors (see below), whose sum is σ = 167003208. Its totient is φ = 166823800.

The previous prime is 166913477. The next prime is 166913521. The reversal of 166913503 is 305319661.

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

It is a cyclic number.

It is not a de Polignac number, because 166913503 - 2⁵ = 166913471 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 (166953503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42001 + ... + 45802.

It is an arithmetic number, because the mean of its divisors is an integer number (41750802).

Almost surely, 2^166913503 is an apocalyptic number.

166913503 is a deficient number, since it is larger than the sum of its proper divisors (89705).

166913503 is an equidigital number, since it uses as much as digits as its factorization.

166913503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89704.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 166913503 is about 12919.5008804520. The cubic root of 166913503 is about 550.5927526774.

The spelling of 166913503 in words is "one hundred sixty-six million, nine hundred thirteen thousand, five hundred three".