2166072513659 has 4 divisors (see below), whose sum is σ = 2173892270304. Its totient is φ = 2158252757016.

The previous prime is 2166072513623. The next prime is 2166072513673. The reversal of 2166072513659 is 9563152706612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166072513659 - 2¹⁶ = 2166072448123 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 2166072513659.

It is not an unprimeable number, because it can be changed into a prime (2166072513359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3909877907 + ... + 3909878460.

It is an arithmetic number, because the mean of its divisors is an integer number (543473067576).

Almost surely, 2^{2166072513659} is an apocalyptic number.

2166072513659 is a deficient number, since it is larger than the sum of its proper divisors (7819756645).

2166072513659 is an equidigital number, since it uses as much as digits as its factorization.

2166072513659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819756644.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 2166072513659 in words is "two trillion, one hundred sixty-six billion, seventy-two million, five hundred thirteen thousand, six hundred fifty-nine".