16445798568 has 72 divisors (see below), whose sum is σ = 44723610750. Its totient is φ = 5459468544.

The previous prime is 16445798549. The next prime is 16445798569. The reversal of 16445798568 is 86589754461.

16445798568 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 579 + 8 + 56 + 8 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 16023002724 + 422795844 = 126582^2 + 20562^2 .

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

It is a super-4 number, since 4×16445798568⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (16445798569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20328148 + ... + 20328956.

Almost surely, 2^16445798568 is an apocalyptic number.

16445798568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16445798568 is an abundant number, since it is smaller than the sum of its proper divisors (28277812182).

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

16445798568 is an equidigital number, since it uses as much as digits as its factorization.

16445798568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1163 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 63.

The spelling of 16445798568 in words is "sixteen billion, four hundred forty-five million, seven hundred ninety-eight thousand, five hundred sixty-eight".