2166161145556 has 48 divisors (see below), whose sum is σ = 3970132992000. Its totient is φ = 1032189171552.

The previous prime is 2166161145527. The next prime is 2166161145559. The reversal of 2166161145556 is 6555411616612.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 34243645 + ... + 34306843.

It is an arithmetic number, because the mean of its divisors is an integer number (82711104000).

Almost surely, 2^{2166161145556} is an apocalyptic number.

It is an amenable number.

2166161145556 is a deficient number, since it is larger than the sum of its proper divisors (1803971846444).

2166161145556 is a wasteful number, since it uses less digits than its factorization.

2166161145556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64588 (or 64586 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 49.

The spelling of 2166161145556 in words is "two trillion, one hundred sixty-six billion, one hundred sixty-one million, one hundred forty-five thousand, five hundred fifty-six".