1115555660129 has 2 divisors, whose sum is σ = 1115555660130. Its totient is φ = 1115555660128.

The previous prime is 1115555660119. The next prime is 1115555660183. The reversal of 1115555660129 is 9210665555111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811125390625 + 304430269504 = 900625^2 + 551752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115555660129 - 2⁴ = 1115555660113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1115555660119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557777830064 + 557777830065.

It is an arithmetic number, because the mean of its divisors is an integer number (557777830065).

Almost surely, 2^{1115555660129} is an apocalyptic number.

It is an amenable number.

1115555660129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115555660129 is an equidigital number, since it uses as much as digits as its factorization.

1115555660129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405000, while the sum is 47.

The spelling of 1115555660129 in words is "one trillion, one hundred fifteen billion, five hundred fifty-five million, six hundred sixty thousand, one hundred twenty-nine".