166221734 has 16 divisors (see below), whose sum is σ = 286180128. Its totient is φ = 70930752.

The previous prime is 166221701. The next prime is 166221739. The reversal of 166221734 is 437122661.

166221734 = 1365² + 1366² + ... + 1448².

It is a self number, because there is not a number n which added to its sum of digits gives 166221734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166221739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22217 + ... + 28740.

It is an arithmetic number, because the mean of its divisors is an integer number (17886258).

Almost surely, 2^166221734 is an apocalyptic number.

166221734 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

166221734 is a deficient number, since it is larger than the sum of its proper divisors (119958394).

166221734 is a wasteful number, since it uses less digits than its factorization.

166221734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51199.

The product of its digits is 12096, while the sum is 32.

The square root of 166221734 is about 12892.7008031677. The cubic root of 166221734 is about 549.8310599588.

The spelling of 166221734 in words is "one hundred sixty-six million, two hundred twenty-one thousand, seven hundred thirty-four".