1155808618861 has 16 divisors (see below), whose sum is σ = 1253054396160. Its totient is φ = 1059775536960.

The previous prime is 1155808618859. The next prime is 1155808618889. The reversal of 1155808618861 is 1688168085511.

It is a cyclic number.

It is not a de Polignac number, because 1155808618861 - 2¹ = 1155808618859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1155808618796 and 1155808618805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155808618891) 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 in 15 ways as a sum of consecutive naturals, for example, 832686 + ... + 1733488.

It is an arithmetic number, because the mean of its divisors is an integer number (78315899760).

Almost surely, 2^{1155808618861} is an apocalyptic number.

It is an amenable number.

1155808618861 is a deficient number, since it is larger than the sum of its proper divisors (97245777299).

1155808618861 is a wasteful number, since it uses less digits than its factorization.

1155808618861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901476.

The product of its (nonzero) digits is 3686400, while the sum is 58.

The spelling of 1155808618861 in words is "one trillion, one hundred fifty-five billion, eight hundred eight million, six hundred eighteen thousand, eight hundred sixty-one".