16518712322 has 18 divisors (see below), whose sum is σ = 28825687683. Its totient is φ = 7078902852.

The previous prime is 16518712321. The next prime is 16518712339. The reversal of 16518712322 is 22321781561.

It can be written as a sum of positive squares in only one way, i.e., 8259356161 + 8259356161 = 90881^2 + 90881^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=90881.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16518712321) 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, 1265843 + ... + 1278825.

Almost surely, 2^16518712322 is an apocalyptic number.

16518712322 is a deficient number, since it is larger than the sum of its proper divisors (12306975361).

16518712322 is an frugal number, since it uses more digits than its factorization.

16518712322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25982 (or 12992 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The spelling of 16518712322 in words is "sixteen billion, five hundred eighteen million, seven hundred twelve thousand, three hundred twenty-two".