1123388581655 has 16 divisors (see below), whose sum is σ = 1350131902464. Its totient is φ = 897334653600.

The previous prime is 1123388581643. The next prime is 1123388581657. The reversal of 1123388581655 is 5561858833211.

It is not a de Polignac number, because 1123388581655 - 2¹⁰ = 1123388580631 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123388581655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123388581657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10754930 + ... + 10858880.

It is an arithmetic number, because the mean of its divisors is an integer number (84383243904).

Almost surely, 2^{1123388581655} is an apocalyptic number.

1123388581655 is a deficient number, since it is larger than the sum of its proper divisors (226743320809).

1123388581655 is a wasteful number, since it uses less digits than its factorization.

1123388581655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107246.

The product of its digits is 6912000, while the sum is 56.

The spelling of 1123388581655 in words is "one trillion, one hundred twenty-three billion, three hundred eighty-eight million, five hundred eighty-one thousand, six hundred fifty-five".