166039720 has 256 divisors, whose sum is σ = 504299520. Its totient is φ = 47692800.

The previous prime is 166039717. The next prime is 166039721. The reversal of 166039720 is 27930661.

It is not an unprimeable number, because it can be changed into a prime (166039721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3532737 + ... + 3532783.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^166039720 is an apocalyptic number.

166039720 is a gapful number since it is divisible by the number (10) 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 166039720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252149760).

166039720 is an abundant number, since it is smaller than the sum of its proper divisors (338259800).

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

166039720 is a wasteful number, since it uses less digits than its factorization.

166039720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 166039720 is about 12885.6400694727. The cubic root of 166039720 is about 549.6302970006.

The spelling of 166039720 in words is "one hundred sixty-six million, thirty-nine thousand, seven hundred twenty".