16806724538 has 4 divisors (see below), whose sum is σ = 25210086810. Its totient is φ = 8403362268.

The previous prime is 16806724481. The next prime is 16806724567. The reversal of 16806724538 is 83542760861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12303911929 + 4502812609 = 110923^2 + 67103^2 .

It is a super-3 number, since 3×16806724538³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4201681133 + ... + 4201681136.

Almost surely, 2^16806724538 is an apocalyptic number.

16806724538 is a deficient number, since it is larger than the sum of its proper divisors (8403362272).

16806724538 is an equidigital number, since it uses as much as digits as its factorization.

16806724538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8403362271.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 16806724538 in words is "sixteen billion, eight hundred six million, seven hundred twenty-four thousand, five hundred thirty-eight".