11651513440 has 96 divisors (see below), whose sum is σ = 31838365440. Its totient is φ = 3946642944.

The previous prime is 11651513417. The next prime is 11651513441. The reversal of 11651513440 is 4431515611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11651513441) 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, 30291 + ... + 155629.

It is an arithmetic number, because the mean of its divisors is an integer number (331649640).

Almost surely, 2^11651513440 is an apocalyptic number.

11651513440 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 11651513440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15919182720).

11651513440 is an abundant number, since it is smaller than the sum of its proper divisors (20186852000).

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

11651513440 is a wasteful number, since it uses less digits than its factorization.

11651513440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125444 (or 125436 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 11651513440 in words is "eleven billion, six hundred fifty-one million, five hundred thirteen thousand, four hundred forty".