16681432320 has 432 divisors, whose sum is σ = 68099146752. Its totient is φ = 3689349120.

The previous prime is 16681432303. The next prime is 16681432349. The reversal of 16681432320 is 2323418661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2496504 + ... + 2503176.

Almost surely, 2^16681432320 is an apocalyptic number.

16681432320 is a gapful number since it is divisible by the number (10) 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 16681432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34049573376).

16681432320 is an abundant number, since it is smaller than the sum of its proper divisors (51417714432).

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

16681432320 is a wasteful number, since it uses less digits than its factorization.

16681432320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738 (or 6721 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 16681432320 in words is "sixteen billion, six hundred eighty-one million, four hundred thirty-two thousand, three hundred twenty".