166266730 has 64 divisors (see below), whose sum is σ = 353590272. Its totient is φ = 55111680.

The previous prime is 166266721. The next prime is 166266743. The reversal of 166266730 is 37662661.

166266730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

166266730 is a nontrivial binomial coefficient, being equal to C(18236, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 166266730.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 318870 + ... + 319390.

It is an arithmetic number, because the mean of its divisors is an integer number (5524848).

Almost surely, 2^166266730 is an apocalyptic number.

166266730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166266730 is the 18235-th triangular number and also the 9118-th hexagonal number.

166266730 is the 6079-th centered nonagonal number.

166266730 is an abundant number, since it is smaller than the sum of its proper divisors (187323542).

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

166266730 is a wasteful number, since it uses less digits than its factorization.

166266730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 166266730 is about 12894.4457034802. The cubic root of 166266730 is about 549.8806683258.

The spelling of 166266730 in words is "one hundred sixty-six million, two hundred sixty-six thousand, seven hundred thirty".