16590212809 has 9 divisors (see below), whose sum is σ = 16720411239. Its totient is φ = 16461023400.

The previous prime is 16590212789. The next prime is 16590212831. The reversal of 16590212809 is 90821209561.

The square root of 16590212809 is 128803.

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

It can be written as a sum of positive squares in only one way, i.e., 958212025 + 15632000784 = 30955^2 + 125028^2 .

It is not a de Polignac number, because 16590212809 - 2¹¹ = 16590210761 is a prime.

It is a super-2 number, since 2×16590212809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16590215809) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19448827 + ... + 19449679.

It is an arithmetic number, because the mean of its divisors is an integer number (1857823471).

Almost surely, 2^16590212809 is an apocalyptic number.

16590212809 is the 128803-rd square number.

16590212809 is the 64402-nd centered octagonal number.

It is an amenable number.

16590212809 is a deficient number, since it is larger than the sum of its proper divisors (130198430).

16590212809 is an frugal number, since it uses more digits than its factorization.

16590212809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 16590212809 in words is "sixteen billion, five hundred ninety million, two hundred twelve thousand, eight hundred nine".