166721148 has 72 divisors (see below), whose sum is σ = 470486016. Its totient is φ = 49341600.

The previous prime is 166721141. The next prime is 166721153. The reversal of 166721148 is 841127661.

It is a happy number.

166721148 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166721141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12133 + ... + 21923.

It is an arithmetic number, because the mean of its divisors is an integer number (6534528).

Almost surely, 2^166721148 is an apocalyptic number.

166721148 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166721148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235243008).

166721148 is an abundant number, since it is smaller than the sum of its proper divisors (303764868).

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

166721148 is a wasteful number, since it uses less digits than its factorization.

166721148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9855 (or 9850 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 166721148 is about 12912.0543679153. The cubic root of 166721148 is about 550.3811660828.

The spelling of 166721148 in words is "one hundred sixty-six million, seven hundred twenty-one thousand, one hundred forty-eight".