10555111155509 has 2 divisors, whose sum is σ = 10555111155510. Its totient is φ = 10555111155508.

The previous prime is 10555111155487. The next prime is 10555111155587. The reversal of 10555111155509 is 90555111155501.

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., 10417208104900 + 137903050609 = 3227570^2 + 371353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10555111155509 is a prime.

It is a super-2 number, since 2×10555111155509² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10555111155509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10555111151509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277555577754 + 5277555577755.

It is an arithmetic number, because the mean of its divisors is an integer number (5277555577755).

Almost surely, 2^{10555111155509} is an apocalyptic number.

It is an amenable number.

10555111155509 is a deficient number, since it is larger than the sum of its proper divisors (1).

10555111155509 is an equidigital number, since it uses as much as digits as its factorization.

10555111155509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140625, while the sum is 44.

The spelling of 10555111155509 in words is "ten trillion, five hundred fifty-five billion, one hundred eleven million, one hundred fifty-five thousand, five hundred nine".