15553553664 has 144 divisors (see below), whose sum is σ = 45834001920. Its totient is φ = 4642682880.

The previous prime is 15553553651. The next prime is 15553553669. The reversal of 15553553664 is 46635535551.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15553553669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552277 + ... + 579755.

It is an arithmetic number, because the mean of its divisors is an integer number (318291680).

Almost surely, 2^15553553664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15553553664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22917000960).

15553553664 is an abundant number, since it is smaller than the sum of its proper divisors (30280448256).

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

15553553664 is a wasteful number, since it uses less digits than its factorization.

15553553664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27576 (or 27562 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 48.

The spelling of 15553553664 in words is "fifteen billion, five hundred fifty-three million, five hundred fifty-three thousand, six hundred sixty-four".