2195980197889 has 2 divisors, whose sum is σ = 2195980197890. Its totient is φ = 2195980197888.

The previous prime is 2195980197881. The next prime is 2195980197899. The reversal of 2195980197889 is 9887910895912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1633130643600 + 562849554289 = 1277940^2 + 750233^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195980197889 - 2³ = 2195980197881 is a prime.

It is a super-2 number, since 2×2195980197889² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2195980197881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097990098944 + 1097990098945.

It is an arithmetic number, because the mean of its divisors is an integer number (1097990098945).

Almost surely, 2^{2195980197889} is an apocalyptic number.

It is an amenable number.

2195980197889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195980197889 is an equidigital number, since it uses as much as digits as its factorization.

2195980197889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235146240, while the sum is 76.

The spelling of 2195980197889 in words is "two trillion, one hundred ninety-five billion, nine hundred eighty million, one hundred ninety-seven thousand, eight hundred eighty-nine".