1128388423681 has 16 divisors (see below), whose sum is σ = 1185644044800. Its totient is φ = 1071819327040.

The previous prime is 1128388423633. The next prime is 1128388423697. The reversal of 1128388423681 is 1863248838211.

It is a cyclic number.

It is not a de Polignac number, because 1128388423681 - 2³⁵ = 1094028685313 is a prime.

It is a super-2 number, since 2×1128388423681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128388426681) 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, 14598171 + ... + 14675263.

It is an arithmetic number, because the mean of its divisors is an integer number (74102752800).

Almost surely, 2^{1128388423681} is an apocalyptic number.

It is an amenable number.

1128388423681 is a deficient number, since it is larger than the sum of its proper divisors (57255621119).

1128388423681 is a wasteful number, since it uses less digits than its factorization.

1128388423681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81536.

The product of its digits is 3538944, while the sum is 55.

The spelling of 1128388423681 in words is "one trillion, one hundred twenty-eight billion, three hundred eighty-eight million, four hundred twenty-three thousand, six hundred eighty-one".