111106778557 has 2 divisors, whose sum is σ = 111106778558. Its totient is φ = 111106778556.

The previous prime is 111106778551. The next prime is 111106778567. The reversal of 111106778557 is 755877601111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90597388036 + 20509390521 = 300994^2 + 143211^2 .

It is an emirp because it is prime and its reverse (755877601111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111106778557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111106778557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111106778551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55553389278 + 55553389279.

It is an arithmetic number, because the mean of its divisors is an integer number (55553389279).

Almost surely, 2^111106778557 is an apocalyptic number.

It is an amenable number.

111106778557 is a deficient number, since it is larger than the sum of its proper divisors (1).

111106778557 is an equidigital number, since it uses as much as digits as its factorization.

111106778557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 411600, while the sum is 49.

The spelling of 111106778557 in words is "one hundred eleven billion, one hundred six million, seven hundred seventy-eight thousand, five hundred fifty-seven".