16557446722464 has 144 divisors (see below), whose sum is σ = 47555855028864. Its totient is φ = 5463995328000.

The previous prime is 16557446722457. The next prime is 16557446722469. The reversal of 16557446722464 is 46422764475561.

It is a happy number.

16557446722464 is a `hidden beast` number, since 1 + 6 + 5 + 57 + 44 + 67 + 22 + 464 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (16557446722469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 435806509 + ... + 435844499.

It is an arithmetic number, because the mean of its divisors is an integer number (330248993256).

Almost surely, 2^{16557446722464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16557446722464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23777927514432).

16557446722464 is an abundant number, since it is smaller than the sum of its proper divisors (30998408306400).

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

16557446722464 is a wasteful number, since it uses less digits than its factorization.

16557446722464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53091 (or 53080 counting only the distinct ones).

The product of its digits is 270950400, while the sum is 63.

The spelling of 16557446722464 in words is "sixteen trillion, five hundred fifty-seven billion, four hundred forty-six million, seven hundred twenty-two thousand, four hundred sixty-four".