16140666320 has 80 divisors (see below), whose sum is σ = 39776449680. Its totient is φ = 6070075392.

The previous prime is 16140666317. The next prime is 16140666331. The reversal of 16140666320 is 2366604161.

It can be written as a sum of positive squares in 8 ways, for example, as 837986704 + 15302679616 = 28948^2 + 123704^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×16140666320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1399136 + ... + 1410624.

It is an arithmetic number, because the mean of its divisors is an integer number (497205621).

Almost surely, 2^16140666320 is an apocalyptic number.

16140666320 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 16140666320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19888224840).

16140666320 is an abundant number, since it is smaller than the sum of its proper divisors (23635783360).

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

16140666320 is a wasteful number, since it uses less digits than its factorization.

16140666320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12552 (or 12546 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 16140666320 in words is "sixteen billion, one hundred forty million, six hundred sixty-six thousand, three hundred twenty".