16661632 has 128 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 6635520.

The previous prime is 16661629. The next prime is 16661681. The reversal of 16661632 is 23616661.

16661632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 16661594 and 16661603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537457 + ... + 537487.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 2^16661632 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 16661632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20563200).

16661632 is an abundant number, since it is smaller than the sum of its proper divisors (24464768).

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

16661632 is a wasteful number, since it uses less digits than its factorization.

16661632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 82 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 16661632 is about 4081.8662398467. The cubic root of 16661632 is about 255.4107541238.

The spelling of 16661632 in words is "sixteen million, six hundred sixty-one thousand, six hundred thirty-two".