166661115 has 64 divisors (see below), whose sum is σ = 301916160. Its totient is φ = 78059520.

The previous prime is 166661039. The next prime is 166661123. The reversal of 166661115 is 511166661.

It is not a de Polignac number, because 166661115 - 2¹⁶ = 166595579 is a prime.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 228882 + ... + 229608.

It is an arithmetic number, because the mean of its divisors is an integer number (4717440).

Almost surely, 2^166661115 is an apocalyptic number.

166661115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166661115 is a deficient number, since it is larger than the sum of its proper divisors (135255045).

166661115 is a wasteful number, since it uses less digits than its factorization.

166661115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its digits is 6480, while the sum is 33.

The square root of 166661115 is about 12909.7294704421. The cubic root of 166661115 is about 550.3150976814.

The spelling of 166661115 in words is "one hundred sixty-six million, six hundred sixty-one thousand, one hundred fifteen".