1155805811551 has 2 divisors, whose sum is σ = 1155805811552. Its totient is φ = 1155805811550.

The previous prime is 1155805811549. The next prime is 1155805811581. The reversal of 1155805811551 is 1551185085511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155805811551 - 2¹ = 1155805811549 is a prime.

Together with 1155805811549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155805811581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577902905775 + 577902905776.

It is an arithmetic number, because the mean of its divisors is an integer number (577902905776).

Almost surely, 2^{1155805811551} is an apocalyptic number.

1155805811551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155805811551 is an equidigital number, since it uses as much as digits as its factorization.

1155805811551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200000, while the sum is 46.

The spelling of 1155805811551 in words is "one trillion, one hundred fifty-five billion, eight hundred five million, eight hundred eleven thousand, five hundred fifty-one".