166115730 has 32 divisors (see below), whose sum is σ = 434922048. Its totient is φ = 40270400.

The previous prime is 166115711. The next prime is 166115731. The reversal of 166115730 is 37511661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166115731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251361 + ... + 252020.

It is an arithmetic number, because the mean of its divisors is an integer number (13591314).

Almost surely, 2^166115730 is an apocalyptic number.

166115730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166115730 is an abundant number, since it is smaller than the sum of its proper divisors (268806318).

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

166115730 is a wasteful number, since it uses less digits than its factorization.

166115730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503402.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 166115730 is about 12888.5891392348. The cubic root of 166115730 is about 549.7141544967.

It can be divided in two parts, 1661 and 15730, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 166115730 in words is "one hundred sixty-six million, one hundred fifteen thousand, seven hundred thirty".