16921673280 has 448 divisors, whose sum is σ = 61485231360. Its totient is φ = 4379443200.

The previous prime is 16921673267. The next prime is 16921673309. The reversal of 16921673280 is 8237612961.

16921673280 is a `hidden beast` number, since 169 + 2 + 167 + 328 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51122715 + ... + 51123045.

It is an arithmetic number, because the mean of its divisors is an integer number (137243820).

Almost surely, 2^16921673280 is an apocalyptic number.

16921673280 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 16921673280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30742615680).

16921673280 is an abundant number, since it is smaller than the sum of its proper divisors (44563558080).

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

16921673280 is a wasteful number, since it uses less digits than its factorization.

16921673280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 16921673280 in words is "sixteen billion, nine hundred twenty-one million, six hundred seventy-three thousand, two hundred eighty".