16556345572 has 24 divisors (see below), whose sum is σ = 32278289400. Its totient is φ = 7377893376.

The previous prime is 16556345551. The next prime is 16556345581. The reversal of 16556345572 is 27554365561.

It can be written as a sum of positive squares in 4 ways, for example, as 342398016 + 16213947556 = 18504^2 + 127334^2 .

It is a super-2 number, since 2×16556345572² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5487997 + ... + 5491012.

It is an arithmetic number, because the mean of its divisors is an integer number (1344928725).

Almost surely, 2^16556345572 is an apocalyptic number.

It is an amenable number.

16556345572 is a deficient number, since it is larger than the sum of its proper divisors (15721943828).

16556345572 is a wasteful number, since it uses less digits than its factorization.

16556345572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10979055 (or 10979053 counting only the distinct ones).

The product of its digits is 3780000, while the sum is 49.

The spelling of 16556345572 in words is "sixteen billion, five hundred fifty-six million, three hundred forty-five thousand, five hundred seventy-two".