2165981671307 has 8 divisors (see below), whose sum is σ = 2167501635936. Its totient is φ = 2164461950272.

The previous prime is 2165981671277. The next prime is 2165981671331. The reversal of 2165981671307 is 7031761895612.

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 2165981671307 - 2¹² = 2165981667211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165981611307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20020583 + ... + 20128479.

It is an arithmetic number, because the mean of its divisors is an integer number (270937704492).

Almost surely, 2^{2165981671307} is an apocalyptic number.

2165981671307 is a deficient number, since it is larger than the sum of its proper divisors (1519964629).

2165981671307 is a wasteful number, since it uses less digits than its factorization.

2165981671307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121797.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The spelling of 2165981671307 in words is "two trillion, one hundred sixty-five billion, nine hundred eighty-one million, six hundred seventy-one thousand, three hundred seven".