2161116112061 has 2 divisors, whose sum is σ = 2161116112062. Its totient is φ = 2161116112060.

The previous prime is 2161116112021. The next prime is 2161116112063. The reversal of 2161116112061 is 1602116111612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1521645602500 + 639470509561 = 1233550^2 + 799669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161116112061 - 2³⁰ = 2160042370237 is a prime.

Together with 2161116112063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161116112063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080558056030 + 1080558056031.

It is an arithmetic number, because the mean of its divisors is an integer number (1080558056031).

Almost surely, 2^{2161116112061} is an apocalyptic number.

It is an amenable number.

2161116112061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161116112061 is an equidigital number, since it uses as much as digits as its factorization.

2161116112061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 29.

The spelling of 2161116112061 in words is "two trillion, one hundred sixty-one billion, one hundred sixteen million, one hundred twelve thousand, sixty-one".