16261321660 has 96 divisors (see below), whose sum is σ = 35461153728. Its totient is φ = 6258954240.

The previous prime is 16261321621. The next prime is 16261321679. The reversal of 16261321660 is 6612316261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48253012 + ... + 48253348.

It is an arithmetic number, because the mean of its divisors is an integer number (369387018).

Almost surely, 2^16261321660 is an apocalyptic number.

16261321660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16261321660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17730576864).

16261321660 is an abundant number, since it is smaller than the sum of its proper divisors (19199832068).

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

16261321660 is a wasteful number, since it uses less digits than its factorization.

16261321660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 16261321660 in words is "sixteen billion, two hundred sixty-one million, three hundred twenty-one thousand, six hundred sixty".