1165720731168 has 192 divisors, whose sum is σ = 3620102492160. Its totient is φ = 321369388032.

The previous prime is 1165720731157. The next prime is 1165720731169. The reversal of 1165720731168 is 8611370275611.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1165720731169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31298605 + ... + 31335827.

It is an arithmetic number, because the mean of its divisors is an integer number (18854700480).

Almost surely, 2^{1165720731168} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165720731168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1810051246080).

1165720731168 is an abundant number, since it is smaller than the sum of its proper divisors (2454381760992).

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

1165720731168 is a wasteful number, since it uses less digits than its factorization.

1165720731168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38879 (or 38871 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 1165720731168 in words is "one trillion, one hundred sixty-five billion, seven hundred twenty million, seven hundred thirty-one thousand, one hundred sixty-eight".