1181266405520 has 160 divisors (see below), whose sum is σ = 2986201728000. Its totient is φ = 432914872320.

The previous prime is 1181266405493. The next prime is 1181266405523. The reversal of 1181266405520 is 255046621811.

It is not an unprimeable number, because it can be changed into a prime (1181266405523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80520746 + ... + 80535414.

It is an arithmetic number, because the mean of its divisors is an integer number (18663760800).

Almost surely, 2^{1181266405520} is an apocalyptic number.

1181266405520 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 1181266405520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493100864000).

1181266405520 is an abundant number, since it is smaller than the sum of its proper divisors (1804935322480).

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

1181266405520 is a wasteful number, since it uses less digits than its factorization.

1181266405520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16441 (or 16435 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 1181266405520 in words is "one trillion, one hundred eighty-one billion, two hundred sixty-six million, four hundred five thousand, five hundred twenty".