616706639981 has 2 divisors, whose sum is σ = 616706639982. Its totient is φ = 616706639980.

The previous prime is 616706639959. The next prime is 616706640007. The reversal of 616706639981 is 189936607616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329314151881 + 287392488100 = 573859^2 + 536090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616706639981 is a prime.

It is a super-3 number, since 3×616706639981³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616706639951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308353319990 + 308353319991.

It is an arithmetic number, because the mean of its divisors is an integer number (308353319991).

Almost surely, 2^616706639981 is an apocalyptic number.

It is an amenable number.

616706639981 is a deficient number, since it is larger than the sum of its proper divisors (1).

616706639981 is an equidigital number, since it uses as much as digits as its factorization.

616706639981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17635968, while the sum is 62.

The spelling of 616706639981 in words is "six hundred sixteen billion, seven hundred six million, six hundred thirty-nine thousand, nine hundred eighty-one".