2166321653643 has 16 divisors (see below), whose sum is σ = 3346281591296. Its totient is φ = 1220940578880.

The previous prime is 2166321653627. The next prime is 2166321653681. The reversal of 2166321653643 is 3463561236612.

It is not a de Polignac number, because 2166321653643 - 2⁴ = 2166321653627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166321653592 and 2166321653601.

It is not an unprimeable number, because it can be changed into a prime (2166321653693) 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, 706561303 + ... + 706564368.

It is an arithmetic number, because the mean of its divisors is an integer number (209142599456).

Almost surely, 2^{2166321653643} is an apocalyptic number.

2166321653643 is a deficient number, since it is larger than the sum of its proper divisors (1179959937653).

2166321653643 is a wasteful number, since it uses less digits than its factorization.

2166321653643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413125754.

The product of its digits is 2799360, while the sum is 48.

The spelling of 2166321653643 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-one million, six hundred fifty-three thousand, six hundred forty-three".