2166221655255 has 16 divisors (see below), whose sum is σ = 3961091026944. Its totient is φ = 990272756640.

The previous prime is 2166221655211. The next prime is 2166221655337. The reversal of 2166221655255 is 5525561226612.

It is a happy number.

It is not a de Polignac number, because 2166221655255 - 2⁷ = 2166221655127 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10315341111 + ... + 10315341320.

It is an arithmetic number, because the mean of its divisors is an integer number (247568189184).

Almost surely, 2^{2166221655255} is an apocalyptic number.

2166221655255 is a deficient number, since it is larger than the sum of its proper divisors (1794869371689).

2166221655255 is a wasteful number, since it uses less digits than its factorization.

2166221655255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20630682446.

The product of its digits is 2160000, while the sum is 48.

The spelling of 2166221655255 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-five thousand, two hundred fifty-five".