1089444555165 has 32 divisors (see below), whose sum is σ = 1773747634176. Its totient is φ = 570870273600.

The previous prime is 1089444555151. The next prime is 1089444555193. The reversal of 1089444555165 is 5615554449801.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1089444555165 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1030261 + ... + 1800090.

It is an arithmetic number, because the mean of its divisors is an integer number (55429613568).

Almost surely, 2^{1089444555165} is an apocalyptic number.

1089444555165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1089444555165 is a deficient number, since it is larger than the sum of its proper divisors (684303079011).

1089444555165 is a wasteful number, since it uses less digits than its factorization.

1089444555165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830809.

The product of its (nonzero) digits is 17280000, while the sum is 57.

The spelling of 1089444555165 in words is "one trillion, eighty-nine billion, four hundred forty-four million, five hundred fifty-five thousand, one hundred sixty-five".