111561364067537 has 2 divisors, whose sum is σ = 111561364067538. Its totient is φ = 111561364067536.

The previous prime is 111561364067533. The next prime is 111561364067551. The reversal of 111561364067537 is 735760463165111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69153344590801 + 42408019476736 = 8315849^2 + 6512144^2 .

It is an emirp because it is prime and its reverse (735760463165111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111561364067537 - 2² = 111561364067533 is a prime.

It is not a weakly prime, because it can be changed into another prime (111561364067533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55780682033768 + 55780682033769.

It is an arithmetic number, because the mean of its divisors is an integer number (55780682033769).

Almost surely, 2^{111561364067537} is an apocalyptic number.

It is an amenable number.

111561364067537 is a deficient number, since it is larger than the sum of its proper divisors (1).

111561364067537 is an equidigital number, since it uses as much as digits as its factorization.

111561364067537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9525600, while the sum is 56.

The spelling of 111561364067537 in words is "one hundred eleven trillion, five hundred sixty-one billion, three hundred sixty-four million, sixty-seven thousand, five hundred thirty-seven".