616868420081 has 2 divisors, whose sum is σ = 616868420082. Its totient is φ = 616868420080.

The previous prime is 616868420023. The next prime is 616868420087. The reversal of 616868420081 is 180024868616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495276730081 + 121591690000 = 703759^2 + 348700^2 .

It is a cyclic number.

It is not a de Polignac number, because 616868420081 - 2²² = 616864225777 is a prime.

It is a super-2 number, since 2×616868420081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (616868420087) 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, 308434210040 + 308434210041.

It is an arithmetic number, because the mean of its divisors is an integer number (308434210041).

Almost surely, 2^616868420081 is an apocalyptic number.

It is an amenable number.

616868420081 is a deficient number, since it is larger than the sum of its proper divisors (1).

616868420081 is an equidigital number, since it uses as much as digits as its factorization.

616868420081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 50.

The spelling of 616868420081 in words is "six hundred sixteen billion, eight hundred sixty-eight million, four hundred twenty thousand, eighty-one".