13555143440 has 40 divisors (see below), whose sum is σ = 31592840280. Its totient is φ = 5408787456.

The previous prime is 13555143439. The next prime is 13555143479. The reversal of 13555143440 is 4434155531.

It can be written as a sum of positive squares in 4 ways, for example, as 6771314944 + 6783828496 = 82288^2 + 82364^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 13555143440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174419 + ... + 239858.

It is an arithmetic number, because the mean of its divisors is an integer number (789821007).

Almost surely, 2^13555143440 is an apocalyptic number.

13555143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13555143440 is an abundant number, since it is smaller than the sum of its proper divisors (18037696840).

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

13555143440 is a wasteful number, since it uses less digits than its factorization.

13555143440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414699 (or 414693 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 13555143440 its reverse (4434155531), we get a palindrome (17989298971).

The spelling of 13555143440 in words is "thirteen billion, five hundred fifty-five million, one hundred forty-three thousand, four hundred forty".