16537188409 has 9 divisors (see below), whose sum is σ = 19238184741. Its totient is φ = 14173961340.

The previous prime is 16537188401. The next prime is 16537188427. The reversal of 16537188409 is 90488173561.

The square root of 16537188409 is 128597.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 16537188409 - 2³ = 16537188401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16537188401) 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 8 ways as a sum of consecutive naturals, for example, 890994 + ... + 909364.

Almost surely, 2^16537188409 is an apocalyptic number.

16537188409 is the 128597-th square number.

16537188409 is the 64299-th centered octagonal number.

It is an amenable number.

16537188409 is a deficient number, since it is larger than the sum of its proper divisors (2700996332).

16537188409 is an frugal number, since it uses more digits than its factorization.

16537188409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36756 (or 18378 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 16537188409 in words is "sixteen billion, five hundred thirty-seven million, one hundred eighty-eight thousand, four hundred nine".