1165608721368 has 320 divisors, whose sum is σ = 4254563396160. Its totient is φ = 289329905664.

The previous prime is 1165608721349. The next prime is 1165608721399. The reversal of 1165608721368 is 8631278065611.

It is a happy number.

1165608721368 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 608 + 7 + 21 + 3 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 421080 + ... + 1583832.

It is an arithmetic number, because the mean of its divisors is an integer number (13295510613).

Almost surely, 2^{1165608721368} is an apocalyptic number.

1165608721368 is a gapful number since it is divisible by the number (18) 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 1165608721368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2127281698080).

1165608721368 is an abundant number, since it is smaller than the sum of its proper divisors (3088954674792).

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

1165608721368 is a wasteful number, since it uses less digits than its factorization.

1165608721368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162808 (or 1162795 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 1165608721368 in words is "one trillion, one hundred sixty-five billion, six hundred eight million, seven hundred twenty-one thousand, three hundred sixty-eight".