2116610522681 has 2 divisors, whose sum is σ = 2116610522682. Its totient is φ = 2116610522680.

The previous prime is 2116610522597. The next prime is 2116610522693. The reversal of 2116610522681 is 1862250166112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1548757849081 + 567852673600 = 1244491^2 + 753560^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116610522681 - 2¹⁸ = 2116610260537 is a prime.

It is a super-2 number, since 2×2116610522681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2116610522381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058305261340 + 1058305261341.

It is an arithmetic number, because the mean of its divisors is an integer number (1058305261341).

Almost surely, 2^{2116610522681} is an apocalyptic number.

It is an amenable number.

2116610522681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116610522681 is an equidigital number, since it uses as much as digits as its factorization.

2116610522681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

Adding to 2116610522681 its reverse (1862250166112), we get a palindrome (3978860688793).

The spelling of 2116610522681 in words is "two trillion, one hundred sixteen billion, six hundred ten million, five hundred twenty-two thousand, six hundred eighty-one".