166052503 has 4 divisors (see below), whose sum is σ = 166254120. Its totient is φ = 165850888.

The previous prime is 166052459. The next prime is 166052507. The reversal of 166052503 is 305250661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305250661 = 191 ⋅1598171.

It is a cyclic number.

It is not a de Polignac number, because 166052503 - 2¹³ = 166044311 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 (166052507) 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, 99568 + ... + 101221.

It is an arithmetic number, because the mean of its divisors is an integer number (41563530).

Almost surely, 2^166052503 is an apocalyptic number.

166052503 is a deficient number, since it is larger than the sum of its proper divisors (201617).

166052503 is an equidigital number, since it uses as much as digits as its factorization.

166052503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201616.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 166052503 is about 12886.1360771955. The cubic root of 166052503 is about 549.6444015449.

The spelling of 166052503 in words is "one hundred sixty-six million, fifty-two thousand, five hundred three".