6657538897 has 2 divisors, whose sum is σ = 6657538898. Its totient is φ = 6657538896.

The previous prime is 6657538891. The next prime is 6657538907. The reversal of 6657538897 is 7988357566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4865202001 + 1792336896 = 69751^2 + 42336^2 .

It is a cyclic number.

It is not a de Polignac number, because 6657538897 - 2¹¹ = 6657536849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6657538891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328769448 + 3328769449.

It is an arithmetic number, because the mean of its divisors is an integer number (3328769449).

Almost surely, 2^6657538897 is an apocalyptic number.

It is an amenable number.

6657538897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6657538897 is an equidigital number, since it uses as much as digits as its factorization.

6657538897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 64.

The square root of 6657538897 is about 81593.7430015317. The cubic root of 6657538897 is about 1881.2127094340.

The spelling of 6657538897 in words is "six billion, six hundred fifty-seven million, five hundred thirty-eight thousand, eight hundred ninety-seven".