616565641 has 2 divisors, whose sum is σ = 616565642. Its totient is φ = 616565640.

The previous prime is 616565611. The next prime is 616565647. The reversal of 616565641 is 146565616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561879616 + 54686025 = 23704^2 + 7395^2 .

It is a cyclic number.

It is not a de Polignac number, because 616565641 - 2⁷ = 616565513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 616565594 and 616565603.

It is not a weakly prime, because it can be changed into another prime (616565647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308282820 + 308282821.

It is an arithmetic number, because the mean of its divisors is an integer number (308282821).

Almost surely, 2^616565641 is an apocalyptic number.

It is an amenable number.

616565641 is a deficient number, since it is larger than the sum of its proper divisors (1).

616565641 is an equidigital number, since it uses as much as digits as its factorization.

616565641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 616565641 is about 24830.7398399645. The cubic root of 616565641 is about 851.1245282309.

The spelling of 616565641 in words is "six hundred sixteen million, five hundred sixty-five thousand, six hundred forty-one".