15551553605504 has 128 divisors (see below), whose sum is σ = 37501481502720. Its totient is φ = 6271033466880.

The previous prime is 15551553605503. The next prime is 15551553605563. The reversal of 15551553605504 is 40550635515551.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551553605503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51745589 + ... + 52045259.

It is an arithmetic number, because the mean of its divisors is an integer number (292980324240).

Almost surely, 2^{15551553605504} is an apocalyptic number.

15551553605504 is a gapful number since it is divisible by the number (14) 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 15551553605504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18750740751360).

15551553605504 is an abundant number, since it is smaller than the sum of its proper divisors (21949927897216).

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

15551553605504 is a wasteful number, since it uses less digits than its factorization.

15551553605504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303116 (or 303104 counting only the distinct ones).

The product of its (nonzero) digits is 5625000, while the sum is 50.

The spelling of 15551553605504 in words is "fifteen trillion, five hundred fifty-one billion, five hundred fifty-three million, six hundred five thousand, five hundred four".