6655817897 has 2 divisors, whose sum is σ = 6655817898. Its totient is φ = 6655817896.

The previous prime is 6655817843. The next prime is 6655817911. The reversal of 6655817897 is 7987185566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3974545936 + 2681271961 = 63044^2 + 51781^2 .

It is a cyclic number.

It is not a de Polignac number, because 6655817897 - 2¹⁰ = 6655816873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6655817807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3327908948 + 3327908949.

It is an arithmetic number, because the mean of its divisors is an integer number (3327908949).

Almost surely, 2^6655817897 is an apocalyptic number.

It is an amenable number.

6655817897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6655817897 is an equidigital number, since it uses as much as digits as its factorization.

6655817897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25401600, while the sum is 62.

The square root of 6655817897 is about 81583.1961680835. The cubic root of 6655817897 is about 1881.0505951684.

The spelling of 6655817897 in words is "six billion, six hundred fifty-five million, eight hundred seventeen thousand, eight hundred ninety-seven".