2116456112561 has 12 divisors (see below), whose sum is σ = 2480793868080. Its totient is φ = 1800257102280.

The previous prime is 2116456112549. The next prime is 2116456112567. The reversal of 2116456112561 is 1652116546112.

It is not a de Polignac number, because 2116456112561 - 2²⁶ = 2116389003697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2116456112567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164852291 + ... + 164865128.

It is an arithmetic number, because the mean of its divisors is an integer number (206732822340).

Almost surely, 2^{2116456112561} is an apocalyptic number.

It is an amenable number.

2116456112561 is a deficient number, since it is larger than the sum of its proper divisors (364337755519).

2116456112561 is a wasteful number, since it uses less digits than its factorization.

2116456112561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329717564 (or 329717557 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The spelling of 2116456112561 in words is "two trillion, one hundred sixteen billion, four hundred fifty-six million, one hundred twelve thousand, five hundred sixty-one".