166318215271 has 4 divisors (see below), whose sum is σ = 179111924152. Its totient is φ = 153524506392.

The previous prime is 166318215251. The next prime is 166318215331. The reversal of 166318215271 is 172512813661.

166318215271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166318215271 - 2⁹ = 166318214759 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 (166318215251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6396854421 + ... + 6396854446.

It is an arithmetic number, because the mean of its divisors is an integer number (44777981038).

Almost surely, 2^166318215271 is an apocalyptic number.

166318215271 is a deficient number, since it is larger than the sum of its proper divisors (12793708881).

166318215271 is a wasteful number, since it uses less digits than its factorization.

166318215271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12793708880.

The product of its digits is 120960, while the sum is 43.

The spelling of 166318215271 in words is "one hundred sixty-six billion, three hundred eighteen million, two hundred fifteen thousand, two hundred seventy-one".