11111115755557 has 2 divisors, whose sum is σ = 11111115755558. Its totient is φ = 11111115755556.

The previous prime is 11111115755549. The next prime is 11111115755567. The reversal of 11111115755557 is 75555751111111.

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., 6235613288641 + 4875502466916 = 2497121^2 + 2208054^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111115755557 - 2³ = 11111115755549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111115755527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555557877778 + 5555557877779.

It is an arithmetic number, because the mean of its divisors is an integer number (5555557877779).

Almost surely, 2^{11111115755557} is an apocalyptic number.

It is an amenable number.

11111115755557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111115755557 is an equidigital number, since it uses as much as digits as its factorization.

11111115755557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153125, while the sum is 46.

Adding to 11111115755557 its reverse (75555751111111), we get a palindrome (86666866866668).

The spelling of 11111115755557 in words is "eleven trillion, one hundred eleven billion, one hundred fifteen million, seven hundred fifty-five thousand, five hundred fifty-seven".