2166135540643 has 8 divisors (see below), whose sum is σ = 2177728148736. Its totient is φ = 2154545553600.

The previous prime is 2166135540619. The next prime is 2166135540659. The reversal of 2166135540643 is 3460455316612.

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 2166135540643 - 2⁹ = 2166135540131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2166135540593 and 2166135540602.

It is not an unprimeable number, because it can be changed into a prime (2166135540343) 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, 1013373 + ... + 2314993.

It is an arithmetic number, because the mean of its divisors is an integer number (272216018592).

Almost surely, 2^{2166135540643} is an apocalyptic number.

2166135540643 is a deficient number, since it is larger than the sum of its proper divisors (11592608093).

2166135540643 is a wasteful number, since it uses less digits than its factorization.

2166135540643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310525.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 2166135540643 in words is "two trillion, one hundred sixty-six billion, one hundred thirty-five million, five hundred forty thousand, six hundred forty-three".