16687221732 has 288 divisors, whose sum is σ = 47186979840. Its totient is φ = 4953312000.

The previous prime is 16687221647. The next prime is 16687221739. The reversal of 16687221732 is 23712278661.

It is not an unprimeable number, because it can be changed into a prime (16687221739) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 127383307 + ... + 127383437.

It is an arithmetic number, because the mean of its divisors is an integer number (163843680).

Almost surely, 2^16687221732 is an apocalyptic number.

16687221732 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 16687221732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23593489920).

16687221732 is an abundant number, since it is smaller than the sum of its proper divisors (30499758108).

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

16687221732 is a wasteful number, since it uses less digits than its factorization.

16687221732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 330 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The spelling of 16687221732 in words is "sixteen billion, six hundred eighty-seven million, two hundred twenty-one thousand, seven hundred thirty-two".