2163981370571 has 2 divisors, whose sum is σ = 2163981370572. Its totient is φ = 2163981370570.

The previous prime is 2163981370567. The next prime is 2163981370633. The reversal of 2163981370571 is 1750731893612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2163981370571 - 2² = 2163981370567 is a prime.

It is not a weakly prime, because it can be changed into another prime (2163981370541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081990685285 + 1081990685286.

It is an arithmetic number, because the mean of its divisors is an integer number (1081990685286).

Almost surely, 2^{2163981370571} is an apocalyptic number.

2163981370571 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163981370571 is an equidigital number, since it uses as much as digits as its factorization.

2163981370571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 2163981370571 in words is "two trillion, one hundred sixty-three billion, nine hundred eighty-one million, three hundred seventy thousand, five hundred seventy-one".