166563131 has 4 divisors (see below), whose sum is σ = 190357872. Its totient is φ = 142768392.

The previous prime is 166563121. The next prime is 166563143. The reversal of 166563131 is 131365661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131365661 = 7 ⋅18766523.

It is a cyclic number.

It is not a de Polignac number, because 166563131 - 2¹⁴ = 166546747 is a prime.

It is a super-2 number, since 2×166563131² = 55486553217046322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166563121) 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, 11897360 + ... + 11897373.

It is an arithmetic number, because the mean of its divisors is an integer number (47589468).

Almost surely, 2^166563131 is an apocalyptic number.

166563131 is a deficient number, since it is larger than the sum of its proper divisors (23794741).

166563131 is an equidigital number, since it uses as much as digits as its factorization.

166563131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23794740.

The product of its digits is 9720, while the sum is 32.

The square root of 166563131 is about 12905.9339452827. The cubic root of 166563131 is about 550.2072287977.

The spelling of 166563131 in words is "one hundred sixty-six million, five hundred sixty-three thousand, one hundred thirty-one".