16409647872 has 72 divisors (see below), whose sum is σ = 48526236080. Its totient is φ = 5469880320.

The previous prime is 16409647867. The next prime is 16409647897. The reversal of 16409647872 is 27874690461.

16409647872 is a `hidden beast` number, since 16 + 4 + 0 + 96 + 478 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180129 + ... + 1193952.

Almost surely, 2^16409647872 is an apocalyptic number.

16409647872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16409647872 is an abundant number, since it is smaller than the sum of its proper divisors (32116588208).

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

16409647872 is an equidigital number, since it uses as much as digits as its factorization.

16409647872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374106 (or 2374086 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 16409647872 in words is "sixteen billion, four hundred nine million, six hundred forty-seven thousand, eight hundred seventy-two".