6616195657 has 2 divisors, whose sum is σ = 6616195658. Its totient is φ = 6616195656.

The previous prime is 6616195583. The next prime is 6616195667. The reversal of 6616195657 is 7565916166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4384955961 + 2231239696 = 66219^2 + 47236^2 .

It is a cyclic number.

It is not a de Polignac number, because 6616195657 - 2¹¹ = 6616193609 is a prime.

It is not a weakly prime, because it can be changed into another prime (6616195667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308097828 + 3308097829.

It is an arithmetic number, because the mean of its divisors is an integer number (3308097829).

Almost surely, 2^6616195657 is an apocalyptic number.

It is an amenable number.

6616195657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616195657 is an equidigital number, since it uses as much as digits as its factorization.

6616195657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 6616195657 is about 81340.0003503811. Note that the first 3 decimals coincide. The cubic root of 6616195657 is about 1877.3105176319.

The spelling of 6616195657 in words is "six billion, six hundred sixteen million, one hundred ninety-five thousand, six hundred fifty-seven".