168666515 has 16 divisors (see below), whose sum is σ = 214010400. Its totient is φ = 127256832.

The previous prime is 168666499. The next prime is 168666539. The reversal of 168666515 is 515666861.

It is not a de Polignac number, because 168666515 - 2⁴ = 168666499 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17879 + ... + 25631.

It is an arithmetic number, because the mean of its divisors is an integer number (13375650).

Almost surely, 2^168666515 is an apocalyptic number.

168666515 is a deficient number, since it is larger than the sum of its proper divisors (45343885).

168666515 is a wasteful number, since it uses less digits than its factorization.

168666515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006.

The product of its digits is 259200, while the sum is 44.

The square root of 168666515 is about 12987.1673200895. The cubic root of 168666515 is about 552.5135804692.

The spelling of 168666515 in words is "one hundred sixty-eight million, six hundred sixty-six thousand, five hundred fifteen".