1155805811553 has 8 divisors (see below), whose sum is σ = 1549683770400. Its totient is φ = 766232530208.

The previous prime is 1155805811551. The next prime is 1155805811581. The reversal of 1155805811553 is 3551185085511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1155805811553 - 2¹ = 1155805811551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155805811551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1076168748 + ... + 1076169821.

It is an arithmetic number, because the mean of its divisors is an integer number (193710471300).

Almost surely, 2^{1155805811553} is an apocalyptic number.

It is an amenable number.

1155805811553 is a deficient number, since it is larger than the sum of its proper divisors (393877958847).

1155805811553 is a wasteful number, since it uses less digits than its factorization.

1155805811553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152338751.

The product of its (nonzero) digits is 600000, while the sum is 48.

The spelling of 1155805811553 in words is "one trillion, one hundred fifty-five billion, eight hundred five million, eight hundred eleven thousand, five hundred fifty-three".