6538189897 has 2 divisors, whose sum is σ = 6538189898. Its totient is φ = 6538189896.

The previous prime is 6538189873. The next prime is 6538189907. The reversal of 6538189897 is 7989818356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6352249401 + 185940496 = 79701^2 + 13636^2 .

It is a cyclic number.

It is not a de Polignac number, because 6538189897 - 2³¹ = 4390706249 is a prime.

It is not a weakly prime, because it can be changed into another prime (6538139897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269094948 + 3269094949.

It is an arithmetic number, because the mean of its divisors is an integer number (3269094949).

Almost surely, 2^6538189897 is an apocalyptic number.

It is an amenable number.

6538189897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6538189897 is an equidigital number, since it uses as much as digits as its factorization.

6538189897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 64.

The square root of 6538189897 is about 80859.0743021462. The cubic root of 6538189897 is about 1869.9034234776.

The spelling of 6538189897 in words is "six billion, five hundred thirty-eight million, one hundred eighty-nine thousand, eight hundred ninety-seven".