6555115657 has 2 divisors, whose sum is σ = 6555115658. Its totient is φ = 6555115656.

The previous prime is 6555115643. The next prime is 6555115661. The reversal of 6555115657 is 7565115556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3876432121 + 2678683536 = 62261^2 + 51756^2 .

It is a cyclic number.

It is not a de Polignac number, because 6555115657 - 2²⁷ = 6420897929 is a prime.

It is not a weakly prime, because it can be changed into another prime (6555110657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277557828 + 3277557829.

It is an arithmetic number, because the mean of its divisors is an integer number (3277557829).

Almost surely, 2^6555115657 is an apocalyptic number.

It is an amenable number.

6555115657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555115657 is an equidigital number, since it uses as much as digits as its factorization.

6555115657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787500, while the sum is 46.

The square root of 6555115657 is about 80963.6687471609. The cubic root of 6555115657 is about 1871.5156059181.

The spelling of 6555115657 in words is "six billion, five hundred fifty-five million, one hundred fifteen thousand, six hundred fifty-seven".