166163801 has 4 divisors (see below), whose sum is σ = 168030900. Its totient is φ = 164296704.

The previous prime is 166163791. The next prime is 166163821. The reversal of 166163801 is 108361661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 108361661 = 29 ⋅3736609.

It can be written as a sum of positive squares in 2 ways, for example, as 77352025 + 88811776 = 8795^2 + 9424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166163801 is a prime.

It is a super-2 number, since 2×166163801² = 55220817525535202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166163821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933416 + ... + 933593.

It is an arithmetic number, because the mean of its divisors is an integer number (42007725).

Almost surely, 2^166163801 is an apocalyptic number.

It is an amenable number.

166163801 is a deficient number, since it is larger than the sum of its proper divisors (1867099).

166163801 is an equidigital number, since it uses as much as digits as its factorization.

166163801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867098.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 166163801 is about 12890.4538709853. The cubic root of 166163801 is about 549.7671752843.

The spelling of 166163801 in words is "one hundred sixty-six million, one hundred sixty-three thousand, eight hundred one".