2163441664381 has 2 divisors, whose sum is σ = 2163441664382. Its totient is φ = 2163441664380.

The previous prime is 2163441664367. The next prime is 2163441664457. The reversal of 2163441664381 is 1834661443612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2076970968900 + 86470695481 = 1441170^2 + 294059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2163441664381 is a prime.

It is a super-2 number, since 2×2163441664381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2163441664481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081720832190 + 1081720832191.

It is an arithmetic number, because the mean of its divisors is an integer number (1081720832191).

Almost surely, 2^{2163441664381} is an apocalyptic number.

It is an amenable number.

2163441664381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163441664381 is an equidigital number, since it uses as much as digits as its factorization.

2163441664381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 49.

The spelling of 2163441664381 in words is "two trillion, one hundred sixty-three billion, four hundred forty-one million, six hundred sixty-four thousand, three hundred eighty-one".