13511112660 has 120 divisors (see below), whose sum is σ = 42539287560. Its totient is φ = 3589837056.

The previous prime is 13511112649. The next prime is 13511112679. The reversal of 13511112660 is 6621111531.

It can be written as a sum of positive squares in 4 ways, for example, as 65318724 + 13445793936 = 8082^2 + 115956^2 .

It is a super-2 number, since 2×13511112660² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 433686 + ... + 463794.

It is an arithmetic number, because the mean of its divisors is an integer number (354494063).

Almost surely, 2^13511112660 is an apocalyptic number.

13511112660 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 13511112660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21269643780).

13511112660 is an abundant number, since it is smaller than the sum of its proper divisors (29028174900).

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

13511112660 is a wasteful number, since it uses less digits than its factorization.

13511112660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30407 (or 30396 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 13511112660 in words is "thirteen billion, five hundred eleven million, one hundred twelve thousand, six hundred sixty".