1165173121320 has 256 divisors, whose sum is σ = 3899911034880. Its totient is φ = 276554649600.

The previous prime is 1165173121271. The next prime is 1165173121363. The reversal of 1165173121320 is 231213715611.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13352230 + ... + 13439210.

It is an arithmetic number, because the mean of its divisors is an integer number (15234027480).

Almost surely, 2^{1165173121320} is an apocalyptic number.

1165173121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165173121320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1949955517440).

1165173121320 is an abundant number, since it is smaller than the sum of its proper divisors (2734737913560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1165173121320 is a wasteful number, since it uses less digits than its factorization.

1165173121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87316 (or 87312 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

Adding to 1165173121320 its reverse (231213715611), we get a palindrome (1396386836931).

The spelling of 1165173121320 in words is "one trillion, one hundred sixty-five billion, one hundred seventy-three million, one hundred twenty-one thousand, three hundred twenty".