166666668515 has 4 divisors (see below), whose sum is σ = 200000002224. Its totient is φ = 133333334808.

The previous prime is 166666668479. The next prime is 166666668523. The reversal of 166666668515 is 515866666661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166666668515 - 2¹⁰ = 166666667491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16666666847 + ... + 16666666856.

It is an arithmetic number, because the mean of its divisors is an integer number (50000000556).

Almost surely, 2^166666668515 is an apocalyptic number.

166666668515 is a deficient number, since it is larger than the sum of its proper divisors (33333333709).

166666668515 is an equidigital number, since it uses as much as digits as its factorization.

166666668515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33333333708.

The product of its digits is 55987200, while the sum is 62.

The spelling of 166666668515 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-eight thousand, five hundred fifteen".