166242803 has 4 divisors (see below), whose sum is σ = 166370160. Its totient is φ = 166115448.

The previous prime is 166242757. The next prime is 166242829. The reversal of 166242803 is 308242661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308242661 = 83 ⋅3713767.

It is a cyclic number.

It is not a de Polignac number, because 166242803 - 2⁸ = 166242547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166242803.

It is not an unprimeable number, because it can be changed into a prime (166242203) 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, 61700 + ... + 64337.

It is an arithmetic number, because the mean of its divisors is an integer number (41592540).

Almost surely, 2^166242803 is an apocalyptic number.

166242803 is a deficient number, since it is larger than the sum of its proper divisors (127357).

166242803 is a wasteful number, since it uses less digits than its factorization.

166242803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127356.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 166242803 is about 12893.5178675178. The cubic root of 166242803 is about 549.8542897754.

The spelling of 166242803 in words is "one hundred sixty-six million, two hundred forty-two thousand, eight hundred three".