166215515 has 16 divisors (see below), whose sum is σ = 211365120. Its totient is φ = 125128800.

The previous prime is 166215493. The next prime is 166215523. The reversal of 166215515 is 515512661.

It is not a de Polignac number, because 166215515 - 2⁶ = 166215451 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8552 + ... + 20138.

It is an arithmetic number, because the mean of its divisors is an integer number (13210320).

Almost surely, 2^166215515 is an apocalyptic number.

166215515 is a deficient number, since it is larger than the sum of its proper divisors (45149605).

166215515 is a wasteful number, since it uses less digits than its factorization.

166215515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11762.

The product of its digits is 9000, while the sum is 32.

The square root of 166215515 is about 12892.4596179317. The cubic root of 166215515 is about 549.8242027689.

The spelling of 166215515 in words is "one hundred sixty-six million, two hundred fifteen thousand, five hundred fifteen".