2166436543 has 8 divisors (see below), whose sum is σ = 2230608512. Its totient is φ = 2102560416.

The previous prime is 2166436537. The next prime is 2166436577. The reversal of 2166436543 is 3456346612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166436543 - 2²⁹ = 1629565631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2166436496 and 2166436505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166436523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59055 + ... + 88432.

It is an arithmetic number, because the mean of its divisors is an integer number (278826064).

Almost surely, 2^2166436543 is an apocalyptic number.

2166436543 is a deficient number, since it is larger than the sum of its proper divisors (64171969).

2166436543 is a wasteful number, since it uses less digits than its factorization.

2166436543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147921.

The product of its digits is 311040, while the sum is 40.

The square root of 2166436543 is about 46544.9948222148. The cubic root of 2166436543 is about 1293.9435325531.

The spelling of 2166436543 in words is "two billion, one hundred sixty-six million, four hundred thirty-six thousand, five hundred forty-three".