166216164 has 12 divisors (see below), whose sum is σ = 387837744. Its totient is φ = 55405384.

The previous prime is 166216163. The next prime is 166216181. The reversal of 166216164 is 461612661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (166216163) 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, 6925662 + ... + 6925685.

It is an arithmetic number, because the mean of its divisors is an integer number (32319812).

Almost surely, 2^166216164 is an apocalyptic number.

It is an amenable number.

166216164 is an abundant number, since it is smaller than the sum of its proper divisors (221621580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166216164 is a wasteful number, since it uses less digits than its factorization.

166216164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13851354 (or 13851352 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 166216164 is about 12892.4847876583. The cubic root of 166216164 is about 549.8249183768.

The spelling of 166216164 in words is "one hundred sixty-six million, two hundred sixteen thousand, one hundred sixty-four".