13155321001550 has 96 divisors (see below), whose sum is σ = 30565052378112. Its totient is φ = 4101301226880.

The previous prime is 13155321001531. The next prime is 13155321001561. The reversal of 13155321001550 is 5510012355131.

It is a super-3 number, since 3×13155321001550³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21271862 + ... + 21881561.

It is an arithmetic number, because the mean of its divisors is an integer number (318385962272).

Almost surely, 2^{13155321001550} is an apocalyptic number.

13155321001550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13155321001550 is an abundant number, since it is smaller than the sum of its proper divisors (17409731376562).

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

13155321001550 is a wasteful number, since it uses less digits than its factorization.

13155321001550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43153522 (or 43153517 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 32.

Adding to 13155321001550 its reverse (5510012355131), we get a palindrome (18665333356681).

The spelling of 13155321001550 in words is "thirteen trillion, one hundred fifty-five billion, three hundred twenty-one million, one thousand, five hundred fifty".