166155115515 has 16 divisors (see below), whose sum is σ = 266149963296. Its totient is φ = 88515468800.

The previous prime is 166155115493. The next prime is 166155115517. The reversal of 166155115515 is 515511551661.

It is not a de Polignac number, because 166155115515 - 2¹⁵ = 166155082747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166155115517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6273396 + ... + 6299825.

It is an arithmetic number, because the mean of its divisors is an integer number (16634372706).

Almost surely, 2^166155115515 is an apocalyptic number.

166155115515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166155115515 is a deficient number, since it is larger than the sum of its proper divisors (99994847781).

166155115515 is a wasteful number, since it uses less digits than its factorization.

166155115515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12574110.

The product of its digits is 112500, while the sum is 42.

The spelling of 166155115515 in words is "one hundred sixty-six billion, one hundred fifty-five million, one hundred fifteen thousand, five hundred fifteen".