16645217472 has 280 divisors, whose sum is σ = 53361108416. Its totient is φ = 5100060672.

The previous prime is 16645217467. The next prime is 16645217489. The reversal of 16645217472 is 27471254661.

16645217472 is a `hidden beast` number, since 1 + 66 + 452 + 1 + 74 + 72 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24732528 + ... + 24733200.

Almost surely, 2^16645217472 is an apocalyptic number.

16645217472 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 16645217472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26680554208).

16645217472 is an abundant number, since it is smaller than the sum of its proper divisors (36715890944).

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

16645217472 is a wasteful number, since it uses less digits than its factorization.

16645217472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1058 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The spelling of 16645217472 in words is "sixteen billion, six hundred forty-five million, two hundred seventeen thousand, four hundred seventy-two".