12643532166320 has 320 divisors, whose sum is σ = 34271521625088. Its totient is φ = 4292580864000.

The previous prime is 12643532166311. The next prime is 12643532166361. The reversal of 12643532166320 is 2366123534621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 161698754 + ... + 161776926.

Almost surely, 2^{12643532166320} is an apocalyptic number.

12643532166320 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 12643532166320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17135760812544).

12643532166320 is an abundant number, since it is smaller than the sum of its proper divisors (21627989458768).

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

12643532166320 is a wasteful number, since it uses less digits than its factorization.

12643532166320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78412 (or 78406 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 12643532166320 in words is "twelve trillion, six hundred forty-three billion, five hundred thirty-two million, one hundred sixty-six thousand, three hundred twenty".