616857444661 has 2 divisors, whose sum is σ = 616857444662. Its totient is φ = 616857444660.

The previous prime is 616857444589. The next prime is 616857444703. The reversal of 616857444661 is 166444758616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 476555508900 + 140301935761 = 690330^2 + 374569^2 .

It is a cyclic number.

It is not a de Polignac number, because 616857444661 - 2¹⁵ = 616857411893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 616857444596 and 616857444605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616857444461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308428722330 + 308428722331.

It is an arithmetic number, because the mean of its divisors is an integer number (308428722331).

Almost surely, 2^616857444661 is an apocalyptic number.

It is an amenable number.

616857444661 is a deficient number, since it is larger than the sum of its proper divisors (1).

616857444661 is an equidigital number, since it uses as much as digits as its factorization.

616857444661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23224320, while the sum is 58.

The spelling of 616857444661 in words is "six hundred sixteen billion, eight hundred fifty-seven million, four hundred forty-four thousand, six hundred sixty-one".