2116613265161 has 4 divisors (see below), whose sum is σ = 2117499250500. Its totient is φ = 2115727279824.

The previous prime is 2116613265157. The next prime is 2116613265163. The reversal of 2116613265161 is 1615623166112.

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 933861313225 + 1182751951936 = 966365^2 + 1087544^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116613265161 - 2² = 2116613265157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116613265163) 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, 442989086 + ... + 442993863.

It is an arithmetic number, because the mean of its divisors is an integer number (529374812625).

Almost surely, 2^{2116613265161} is an apocalyptic number.

It is an amenable number.

2116613265161 is a deficient number, since it is larger than the sum of its proper divisors (885985339).

2116613265161 is an equidigital number, since it uses as much as digits as its factorization.

2116613265161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885985338.

The product of its digits is 77760, while the sum is 41.

The spelling of 2116613265161 in words is "two trillion, one hundred sixteen billion, six hundred thirteen million, two hundred sixty-five thousand, one hundred sixty-one".