16565556563057 has 2 divisors, whose sum is σ = 16565556563058. Its totient is φ = 16565556563056.

The previous prime is 16565556563033. The next prime is 16565556563093. The reversal of 16565556563057 is 75036565556561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16218734508001 + 346822055056 = 4027249^2 + 588916^2 .

It is a cyclic number.

It is not a de Polignac number, because 16565556563057 - 2¹² = 16565556558961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16565556562984 and 16565556563002.

It is not a weakly prime, because it can be changed into another prime (16565556565057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282778281528 + 8282778281529.

It is an arithmetic number, because the mean of its divisors is an integer number (8282778281529).

Almost surely, 2^{16565556563057} is an apocalyptic number.

It is an amenable number.

16565556563057 is a deficient number, since it is larger than the sum of its proper divisors (1).

16565556563057 is an equidigital number, since it uses as much as digits as its factorization.

16565556563057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 425250000, while the sum is 65.

The spelling of 16565556563057 in words is "sixteen trillion, five hundred sixty-five billion, five hundred fifty-six million, five hundred sixty-three thousand, fifty-seven".