16117565641 has 2 divisors, whose sum is σ = 16117565642. Its totient is φ = 16117565640.

The previous prime is 16117565609. The next prime is 16117565647. The reversal of 16117565641 is 14656571161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8313610041 + 7803955600 = 91179^2 + 88340^2 .

It is a cyclic number.

It is not a de Polignac number, because 16117565641 - 2⁵ = 16117565609 is a prime.

It is not a weakly prime, because it can be changed into another prime (16117565647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8058782820 + 8058782821.

It is an arithmetic number, because the mean of its divisors is an integer number (8058782821).

Almost surely, 2^16117565641 is an apocalyptic number.

It is an amenable number.

16117565641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16117565641 is an equidigital number, since it uses as much as digits as its factorization.

16117565641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The spelling of 16117565641 in words is "sixteen billion, one hundred seventeen million, five hundred sixty-five thousand, six hundred forty-one".