16543961666560 has 352 divisors, whose sum is σ = 43090570470528. Its totient is φ = 6070043934720.

The previous prime is 16543961666503. The next prime is 16543961666567. The reversal of 16543961666560 is 6566616934561.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 16543961666492 and 16543961666501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16543961666567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4664210707 + ... + 4664214253.

Almost surely, 2^{16543961666560} is an apocalyptic number.

16543961666560 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 16543961666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21545285235264).

16543961666560 is an abundant number, since it is smaller than the sum of its proper divisors (26546608803968).

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

16543961666560 is a wasteful number, since it uses less digits than its factorization.

16543961666560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937 (or 4919 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 64.

The spelling of 16543961666560 in words is "sixteen trillion, five hundred forty-three billion, nine hundred sixty-one million, six hundred sixty-six thousand, five hundred sixty".