2166221654655 has 64 divisors (see below), whose sum is σ = 3707189451648. Its totient is φ = 1076296089600.

The previous prime is 2166221654599. The next prime is 2166221654711. The reversal of 2166221654655 is 5564561226612.

It is an interprime number because it is at equal distance from previous prime (2166221654599) and next prime (2166221654711).

It is not a de Polignac number, because 2166221654655 - 2⁹ = 2166221654143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 2166221654598 and 2166221654607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116222997 + ... + 116241633.

It is an arithmetic number, because the mean of its divisors is an integer number (57924835182).

Almost surely, 2^{2166221654655} is an apocalyptic number.

2166221654655 is a deficient number, since it is larger than the sum of its proper divisors (1540967796993).

2166221654655 is a wasteful number, since it uses less digits than its factorization.

2166221654655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23276.

The product of its digits is 5184000, while the sum is 51.

The spelling of 2166221654655 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-four thousand, six hundred fifty-five".