16531322660 has 12 divisors (see below), whose sum is σ = 34715777628. Its totient is φ = 6612529056.

The previous prime is 16531322659. The next prime is 16531322779. The reversal of 16531322660 is 6622313561.

It can be written as a sum of positive squares in 2 ways, for example, as 2324589796 + 14206732864 = 48214^2 + 119192^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16531322660.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413283047 + ... + 413283086.

It is an arithmetic number, because the mean of its divisors is an integer number (2892981469).

Almost surely, 2^16531322660 is an apocalyptic number.

16531322660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16531322660 is an abundant number, since it is smaller than the sum of its proper divisors (18184454968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16531322660 is a wasteful number, since it uses less digits than its factorization.

16531322660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826566142 (or 826566140 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

Subtracting from 16531322660 its reverse (6622313561), we obtain a palindrome (9909009099).

The spelling of 16531322660 in words is "sixteen billion, five hundred thirty-one million, three hundred twenty-two thousand, six hundred sixty".