16611556595993 has 2 divisors, whose sum is σ = 16611556595994. Its totient is φ = 16611556595992.

The previous prime is 16611556595971. The next prime is 16611556596029. The reversal of 16611556595993 is 39959565511661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11859841091344 + 4751715504649 = 3443812^2 + 2179843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16611556595993 is a prime.

It is not a weakly prime, because it can be changed into another prime (16611556595393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305778297996 + 8305778297997.

It is an arithmetic number, because the mean of its divisors is an integer number (8305778297997).

Almost surely, 2^{16611556595993} is an apocalyptic number.

It is an amenable number.

16611556595993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16611556595993 is an equidigital number, since it uses as much as digits as its factorization.

16611556595993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 295245000, while the sum is 71.

The spelling of 16611556595993 in words is "sixteen trillion, six hundred eleven billion, five hundred fifty-six million, five hundred ninety-five thousand, nine hundred ninety-three".