616326661 has 2 divisors, whose sum is σ = 616326662. Its totient is φ = 616326660.

The previous prime is 616326577. The next prime is 616326713. The reversal of 616326661 is 166623616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581292100 + 35034561 = 24110^2 + 5919^2 .

It is a cyclic number.

It is not a de Polignac number, because 616326661 - 2⁹ = 616326149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616326661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616324661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308163330 + 308163331.

It is an arithmetic number, because the mean of its divisors is an integer number (308163331).

Almost surely, 2^616326661 is an apocalyptic number.

It is an amenable number.

616326661 is a deficient number, since it is larger than the sum of its proper divisors (1).

616326661 is an equidigital number, since it uses as much as digits as its factorization.

616326661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 616326661 is about 24825.9271931584. The cubic root of 616326661 is about 851.0145491190.

The spelling of 616326661 in words is "six hundred sixteen million, three hundred twenty-six thousand, six hundred sixty-one".