2116865381161 has 2 divisors, whose sum is σ = 2116865381162. Its totient is φ = 2116865381160.

The previous prime is 2116865381143. The next prime is 2116865381179. The reversal of 2116865381161 is 1611835686112.

It is a balanced prime because it is at equal distance from previous prime (2116865381143) and next prime (2116865381179).

It can be written as a sum of positive squares in only one way, i.e., 1613042243136 + 503823138025 = 1270056^2 + 709805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116865381161 - 2²³ = 2116856992553 is a prime.

It is a super-2 number, since 2×2116865381161² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2116860381161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058432690580 + 1058432690581.

It is an arithmetic number, because the mean of its divisors is an integer number (1058432690581).

Almost surely, 2^{2116865381161} is an apocalyptic number.

It is an amenable number.

2116865381161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116865381161 is an equidigital number, since it uses as much as digits as its factorization.

2116865381161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 49.

The spelling of 2116865381161 in words is "two trillion, one hundred sixteen billion, eight hundred sixty-five million, three hundred eighty-one thousand, one hundred sixty-one".