166215730 has 8 divisors (see below), whose sum is σ = 299188332. Its totient is φ = 66486288.

The previous prime is 166215701. The next prime is 166215761. The reversal of 166215730 is 37512661.

166215730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 135001161 + 31214569 = 11619^2 + 5587^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 166215692 and 166215701.

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, 8310777 + ... + 8310796.

Almost surely, 2^166215730 is an apocalyptic number.

166215730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166215730 is a deficient number, since it is larger than the sum of its proper divisors (132972602).

166215730 is a wasteful number, since it uses less digits than its factorization.

166215730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16621580.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 166215730 is about 12892.4679561362. The cubic root of 166215730 is about 549.8244398349.

The spelling of 166215730 in words is "one hundred sixty-six million, two hundred fifteen thousand, seven hundred thirty".