2165981671306 has 32 divisors (see below), whose sum is σ = 3287589145920. Its totient is φ = 1070171760000.

The previous prime is 2165981671277. The next prime is 2165981671331. The reversal of 2165981671306 is 6031761895612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315323640 + ... + 315330508.

It is an arithmetic number, because the mean of its divisors is an integer number (102737160810).

Almost surely, 2^{2165981671306} is an apocalyptic number.

2165981671306 is a deficient number, since it is larger than the sum of its proper divisors (1121607474614).

2165981671306 is a wasteful number, since it uses less digits than its factorization.

2165981671306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 2165981671306 in words is "two trillion, one hundred sixty-five billion, nine hundred eighty-one million, six hundred seventy-one thousand, three hundred six".