1165065411280 has 80 divisors (see below), whose sum is σ = 2731006525824. Its totient is φ = 462213527040.

The previous prime is 1165065411277. The next prime is 1165065411281. The reversal of 1165065411280 is 821145605611.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1165065411280² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165065411281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6258750 + ... + 6442210.

Almost surely, 2^{1165065411280} is an apocalyptic number.

1165065411280 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 1165065411280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365503262912).

1165065411280 is an abundant number, since it is smaller than the sum of its proper divisors (1565941114544).

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

1165065411280 is a wasteful number, since it uses less digits than its factorization.

1165065411280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184124 (or 184118 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 1165065411280 in words is "one trillion, one hundred sixty-five billion, sixty-five million, four hundred eleven thousand, two hundred eighty".