15553632432 has 120 divisors (see below), whose sum is σ = 43632177600. Its totient is φ = 4772162304.

The previous prime is 15553632421. The next prime is 15553632433. The reversal of 15553632432 is 23423635551.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (15553632433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3071919 + ... + 3076977.

It is an arithmetic number, because the mean of its divisors is an integer number (363601480).

Almost surely, 2^15553632432 is an apocalyptic number.

15553632432 is a gapful number since it is divisible by the number (12) 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 15553632432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21816088800).

15553632432 is an abundant number, since it is smaller than the sum of its proper divisors (28078545168).

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

15553632432 is a wasteful number, since it uses less digits than its factorization.

15553632432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475 (or 5456 counting only the distinct ones).

The product of its digits is 324000, while the sum is 39.

The spelling of 15553632432 in words is "fifteen billion, five hundred fifty-three million, six hundred thirty-two thousand, four hundred thirty-two".