1165111621720 has 64 divisors (see below), whose sum is σ = 2668598395200. Its totient is φ = 457695444480.

The previous prime is 1165111621633. The next prime is 1165111621747. The reversal of 1165111621720 is 271261115611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1209666 + ... + 1947694.

It is an arithmetic number, because the mean of its divisors is an integer number (41696849925).

Almost surely, 2^{1165111621720} is an apocalyptic number.

1165111621720 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 1165111621720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1334299197600).

1165111621720 is an abundant number, since it is smaller than the sum of its proper divisors (1503486773480).

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

1165111621720 is a wasteful number, since it uses less digits than its factorization.

1165111621720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738748 (or 738744 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 34.

The spelling of 1165111621720 in words is "one trillion, one hundred sixty-five billion, one hundred eleven million, six hundred twenty-one thousand, seven hundred twenty".