11981580912 has 100 divisors (see below), whose sum is σ = 39632225776. Its totient is φ = 3423306240.

The previous prime is 11981580911. The next prime is 11981580953. The reversal of 11981580912 is 21908518911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981580911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 651289 + ... + 669432.

Almost surely, 2^11981580912 is an apocalyptic number.

11981580912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11981580912 is an abundant number, since it is smaller than the sum of its proper divisors (27650644864).

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

11981580912 is a wasteful number, since it uses less digits than its factorization.

11981580912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320748 (or 1320733 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 45.

The spelling of 11981580912 in words is "eleven billion, nine hundred eighty-one million, five hundred eighty thousand, nine hundred twelve".