16509336386 has 16 divisors (see below), whose sum is σ = 25110040824. Its totient is φ = 8140065024.

The previous prime is 16509336383. The next prime is 16509336433. The reversal of 16509336386 is 68363390561.

It can be written as a sum of positive squares in 4 ways, for example, as 15300453025 + 1208883361 = 123695^2 + 34769^2 .

It is a super-2 number, since 2×16509336386² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16509336383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140885 + ... + 229928.

Almost surely, 2^16509336386 is an apocalyptic number.

16509336386 is a deficient number, since it is larger than the sum of its proper divisors (8600704438).

16509336386 is a wasteful number, since it uses less digits than its factorization.

16509336386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371125.

The product of its (nonzero) digits is 2099520, while the sum is 50.

The spelling of 16509336386 in words is "sixteen billion, five hundred nine million, three hundred thirty-six thousand, three hundred eighty-six".