2166161145555 has 128 divisors (see below), whose sum is σ = 4030333148160. Its totient is φ = 982437120000.

The previous prime is 2166161145527. The next prime is 2166161145559. The reversal of 2166161145555 is 5555411616612.

It is not a de Polignac number, because 2166161145555 - 2⁵ = 2166161145523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166161145559) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 118095685 + ... + 118114025.

It is an arithmetic number, because the mean of its divisors is an integer number (31486977720).

Almost surely, 2^{2166161145555} is an apocalyptic number.

2166161145555 is a deficient number, since it is larger than the sum of its proper divisors (1864172002605).

2166161145555 is a wasteful number, since it uses less digits than its factorization.

2166161145555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18853.

The product of its digits is 1080000, while the sum is 48.

The spelling of 2166161145555 in words is "two trillion, one hundred sixty-six billion, one hundred sixty-one million, one hundred forty-five thousand, five hundred fifty-five".