11531480640 has 112 divisors (see below), whose sum is σ = 36837567168. Its totient is φ = 3056154624.

The previous prime is 11531480633. The next prime is 11531480641. The reversal of 11531480640 is 4608413511.

It is not an unprimeable number, because it can be changed into a prime (11531480641) 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, 119634 + ... + 193326.

Almost surely, 2^11531480640 is an apocalyptic number.

11531480640 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 11531480640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18418783584).

11531480640 is an abundant number, since it is smaller than the sum of its proper divisors (25306086528).

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

11531480640 is a wasteful number, since it uses less digits than its factorization.

11531480640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73876 (or 73866 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 11531480640 in words is "eleven billion, five hundred thirty-one million, four hundred eighty thousand, six hundred forty".