16520553232 has 40 divisors (see below), whose sum is σ = 33120380160. Its totient is φ = 7974637440.

The previous prime is 16520553227. The next prime is 16520553307. The reversal of 16520553232 is 23235502561.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168078 + ... + 247570.

It is an arithmetic number, because the mean of its divisors is an integer number (828009504).

Almost surely, 2^16520553232 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 16520553232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16560190080).

16520553232 is an abundant number, since it is smaller than the sum of its proper divisors (16599826928).

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

16520553232 is a wasteful number, since it uses less digits than its factorization.

16520553232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79951 (or 79945 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 34.

The spelling of 16520553232 in words is "sixteen billion, five hundred twenty million, five hundred fifty-three thousand, two hundred thirty-two".