166505216 has 36 divisors (see below), whose sum is σ = 343097664. Its totient is φ = 80563200.

The previous prime is 166505197. The next prime is 166505233. The reversal of 166505216 is 612505661.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2555 + ... + 18426.

Almost surely, 2^166505216 is an apocalyptic number.

166505216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166505216 is an abundant number, since it is smaller than the sum of its proper divisors (176592448).

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

166505216 is an equidigital number, since it uses as much as digits as its factorization.

166505216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21028 (or 21014 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 166505216 is about 12903.6900148756. The cubic root of 166505216 is about 550.1434512869.

The spelling of 166505216 in words is "one hundred sixty-six million, five hundred five thousand, two hundred sixteen".