13155123622440 has 128 divisors (see below), whose sum is σ = 41798931552000. Its totient is φ = 3300724543488.

The previous prime is 13155123622439. The next prime is 13155123622573. The reversal of 13155123622440 is 4422632155131.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6147301 + ... + 8006219.

It is an arithmetic number, because the mean of its divisors is an integer number (326554152750).

Almost surely, 2^{13155123622440} is an apocalyptic number.

13155123622440 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 13155123622440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20899465776000).

13155123622440 is an abundant number, since it is smaller than the sum of its proper divisors (28643807929560).

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

13155123622440 is a wasteful number, since it uses less digits than its factorization.

13155123622440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862419 (or 1862415 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 13155123622440 its reverse (4422632155131), we get a palindrome (17577755777571).

The spelling of 13155123622440 in words is "thirteen trillion, one hundred fifty-five billion, one hundred twenty-three million, six hundred twenty-two thousand, four hundred forty".