2161686713 has 4 divisors (see below), whose sum is σ = 2172659940. Its totient is φ = 2150713488.

The previous prime is 2161686691. The next prime is 2161686721. The reversal of 2161686713 is 3176861612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1954700944 + 206985769 = 44212^2 + 14387^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161686713 - 2⁶ = 2161686649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161686733) 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, 5486318 + ... + 5486711.

It is an arithmetic number, because the mean of its divisors is an integer number (543164985).

Almost surely, 2^2161686713 is an apocalyptic number.

It is an amenable number.

2161686713 is a deficient number, since it is larger than the sum of its proper divisors (10973227).

2161686713 is a wasteful number, since it uses less digits than its factorization.

2161686713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10973226.

The product of its digits is 72576, while the sum is 41.

The square root of 2161686713 is about 46493.9427560193. The cubic root of 2161686713 is about 1292.9971999005.

The spelling of 2161686713 in words is "two billion, one hundred sixty-one million, six hundred eighty-six thousand, seven hundred thirteen".