616721786097211 has 2 divisors, whose sum is σ = 616721786097212. Its totient is φ = 616721786097210.

The previous prime is 616721786097133. The next prime is 616721786097227. The reversal of 616721786097211 is 112790687127616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 616721786097211 - 2³¹ = 616719638613563 is a prime.

It is a super-2 number, since 2×616721786097211² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (616721786091211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308360893048605 + 308360893048606.

It is an arithmetic number, because the mean of its divisors is an integer number (308360893048606).

Almost surely, 2^{616721786097211} is an apocalyptic number.

616721786097211 is a deficient number, since it is larger than the sum of its proper divisors (1).

616721786097211 is an equidigital number, since it uses as much as digits as its factorization.

616721786097211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 64.

The spelling of 616721786097211 in words is "six hundred sixteen trillion, seven hundred twenty-one billion, seven hundred eighty-six million, ninety-seven thousand, two hundred eleven".