166065506111505 has 64 divisors (see below), whose sum is σ = 356750513860608. Its totient is φ = 63705448892160.

The previous prime is 166065506111501. The next prime is 166065506111569. The reversal of 166065506111505 is 505111605560661.

It is not a de Polignac number, because 166065506111505 - 2² = 166065506111501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166065506111501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5529971869 + ... + 5530001898.

It is an arithmetic number, because the mean of its divisors is an integer number (5574226779072).

Almost surely, 2^{166065506111505} is an apocalyptic number.

166065506111505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166065506111505 is an abundant number, since it is smaller than the sum of its proper divisors (190685007749103).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166065506111505 is a wasteful number, since it uses less digits than its factorization.

166065506111505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11059973806.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 166065506111505 in words is "one hundred sixty-six trillion, sixty-five billion, five hundred six million, one hundred eleven thousand, five hundred five".