11901780512 has 48 divisors (see below), whose sum is σ = 24872906520. Its totient is φ = 5586628608.

The previous prime is 11901780509. The next prime is 11901780521. The reversal of 11901780512 is 21508710911.

It can be written as a sum of positive squares in 4 ways, for example, as 11888849296 + 12931216 = 109036^2 + 3596^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188414 + ... + 243522.

Almost surely, 2^11901780512 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 11901780512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12436453260).

11901780512 is an abundant number, since it is smaller than the sum of its proper divisors (12971126008).

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

11901780512 is a wasteful number, since it uses less digits than its factorization.

11901780512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55533 (or 55525 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 35.

The spelling of 11901780512 in words is "eleven billion, nine hundred one million, seven hundred eighty thousand, five hundred twelve".