1165981685736 has 128 divisors (see below), whose sum is σ = 3509509248000. Its totient is φ = 315352300032.

The previous prime is 1165981685681. The next prime is 1165981685761. The reversal of 1165981685736 is 6375861895611.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3873660 + ... + 4163796.

It is an arithmetic number, because the mean of its divisors is an integer number (27418041000).

Almost surely, 2^{1165981685736} 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 1165981685736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1754754624000).

1165981685736 is an abundant number, since it is smaller than the sum of its proper divisors (2343527562264).

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

1165981685736 is a wasteful number, since it uses less digits than its factorization.

1165981685736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291431 (or 291427 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 66.

The spelling of 1165981685736 in words is "one trillion, one hundred sixty-five billion, nine hundred eighty-one million, six hundred eighty-five thousand, seven hundred thirty-six".