2168396861 has 2 divisors, whose sum is σ = 2168396862. Its totient is φ = 2168396860.

The previous prime is 2168396849. The next prime is 2168396873. The reversal of 2168396861 is 1686938612.

2168396861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (2168396849) and next prime (2168396873).

It can be written as a sum of positive squares in only one way, i.e., 1262025625 + 906371236 = 35525^2 + 30106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168396861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2168396821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084198430 + 1084198431.

It is an arithmetic number, because the mean of its divisors is an integer number (1084198431).

Almost surely, 2^2168396861 is an apocalyptic number.

It is an amenable number.

2168396861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168396861 is an equidigital number, since it uses as much as digits as its factorization.

2168396861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 2168396861 is about 46566.0483721778. The cubic root of 2168396861 is about 1294.3336933943. Note that the first 3 decimals are identical.

The spelling of 2168396861 in words is "two billion, one hundred sixty-eight million, three hundred ninety-six thousand, eight hundred sixty-one".