66323012321280 has 2176 divisors, whose sum is σ = 264678829922304. Its totient is φ = 13951932825600.

The previous prime is 66323012321273. The next prime is 66323012321281. The reversal of 66323012321280 is 8212321032366.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66323012321281) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 236024954740 + ... + 236024955020.

Almost surely, 2^{66323012321280} is an apocalyptic number.

66323012321280 is a gapful number since it is divisible by the number (60) 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 66323012321280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132339414961152).

66323012321280 is an abundant number, since it is smaller than the sum of its proper divisors (198355817601024).

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

66323012321280 is a wasteful number, since it uses less digits than its factorization.

66323012321280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 66323012321280 in words is "sixty-six trillion, three hundred twenty-three billion, twelve million, three hundred twenty-one thousand, two hundred eighty".