166165110221055 has 32 divisors (see below), whose sum is σ = 290204960855040. Its totient is φ = 80517314724480.

The previous prime is 166165110221051. The next prime is 166165110221093. The reversal of 166165110221055 is 550122011561661.

It is not a de Polignac number, because 166165110221055 - 2² = 166165110221051 is a prime.

It is a super-2 number, since 2×166165110221055² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166165110220998 and 166165110221016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166165110221051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297139815 + ... + 297698504.

It is an arithmetic number, because the mean of its divisors is an integer number (9068905026720).

Almost surely, 2^{166165110221055} is an apocalyptic number.

166165110221055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166165110221055 is a deficient number, since it is larger than the sum of its proper divisors (124039850633985).

166165110221055 is a wasteful number, since it uses less digits than its factorization.

166165110221055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594840031.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 166165110221055 in words is "one hundred sixty-six trillion, one hundred sixty-five billion, one hundred ten million, two hundred twenty-one thousand, fifty-five".