166721152 has 32 divisors (see below), whose sum is σ = 357692580. Its totient is φ = 76947456.

The previous prime is 166721141. The next prime is 166721153. The reversal of 166721152 is 251127661.

It can be written as a sum of positive squares in 2 ways, for example, as 166513216 + 207936 = 12904^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (166721153) 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, 48433 + ... + 51760.

Almost surely, 2^166721152 is an apocalyptic number.

It is an amenable number.

166721152 is an abundant number, since it is smaller than the sum of its proper divisors (190971428).

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

166721152 is a wasteful number, since it uses less digits than its factorization.

166721152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100220 (or 100208 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 166721152 is about 12912.0545228093. The cubic root of 166721152 is about 550.3811704844.

The spelling of 166721152 in words is "one hundred sixty-six million, seven hundred twenty-one thousand, one hundred fifty-two".