2166221655403 has 16 divisors (see below), whose sum is σ = 2472227122176. Its totient is φ = 1880331033600.

The previous prime is 2166221655397. The next prime is 2166221655449. The reversal of 2166221655403 is 3045561226612.

It is a cyclic number.

It is not a de Polignac number, because 2166221655403 - 2³⁷ = 2028782701931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166221655403.

It is not an unprimeable number, because it can be changed into a prime (2166221685403) 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, 4003626 + ... + 4512367.

It is an arithmetic number, because the mean of its divisors is an integer number (154514195136).

Almost surely, 2^{2166221655403} is an apocalyptic number.

2166221655403 is a deficient number, since it is larger than the sum of its proper divisors (306005466773).

2166221655403 is a wasteful number, since it uses less digits than its factorization.

2166221655403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517174.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 2166221655403 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-five thousand, four hundred three".