13513255440 has 80 divisors (see below), whose sum is σ = 43023311808. Its totient is φ = 3506139648.

The previous prime is 13513255429. The next prime is 13513255447. The reversal of 13513255440 is 4455231531.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (13513255447) 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, 752002 + ... + 769761.

Almost surely, 2^13513255440 is an apocalyptic number.

13513255440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13513255440 is an abundant number, since it is smaller than the sum of its proper divisors (29510056368).

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

13513255440 is a wasteful number, since it uses less digits than its factorization.

13513255440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521816 (or 1521810 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 13513255440 its reverse (4455231531), we get a palindrome (17968486971).

The spelling of 13513255440 in words is "thirteen billion, five hundred thirteen million, two hundred fifty-five thousand, four hundred forty".