166905564143 has 12 divisors (see below), whose sum is σ = 170954874000. Its totient is φ = 162921411072.

The previous prime is 166905564127. The next prime is 166905564191. The reversal of 166905564143 is 341465509661.

It is not a de Polignac number, because 166905564143 - 2⁴ = 166905564127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166905564091 and 166905564100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166905594143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 565358 + ... + 808356.

It is an arithmetic number, because the mean of its divisors is an integer number (14246239500).

Almost surely, 2^166905564143 is an apocalyptic number.

166905564143 is a deficient number, since it is larger than the sum of its proper divisors (4049309857).

166905564143 is an frugal number, since it uses more digits than its factorization.

166905564143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243266 (or 243169 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 166905564143 in words is "one hundred sixty-six billion, nine hundred five million, five hundred sixty-four thousand, one hundred forty-three".