2166118555329 has 24 divisors (see below), whose sum is σ = 3265031233152. Its totient is φ = 1381226616000.

The previous prime is 2166118555273. The next prime is 2166118555369. The reversal of 2166118555329 is 9235558116612.

2166118555329 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 1 + 1 + 85 + 553 + 2 + 9 = 666.

It is not a de Polignac number, because 2166118555329 - 2⁷ = 2166118555201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166118555369) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4261909 + ... + 4743005.

It is an arithmetic number, because the mean of its divisors is an integer number (136042968048).

Almost surely, 2^{2166118555329} is an apocalyptic number.

It is an amenable number.

2166118555329 is a deficient number, since it is larger than the sum of its proper divisors (1098912677823).

2166118555329 is a wasteful number, since it uses less digits than its factorization.

2166118555329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502877 (or 502874 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The spelling of 2166118555329 in words is "two trillion, one hundred sixty-six billion, one hundred eighteen million, five hundred fifty-five thousand, three hundred twenty-nine".