66873999015824 has 320 divisors, whose sum is σ = 181850974126080. Its totient is φ = 22980132864000.

The previous prime is 66873999015821. The next prime is 66873999015937. The reversal of 66873999015824 is 42851099937866.

It is a Harshad number since it is a multiple of its sum of digits (77).

It is not an unprimeable number, because it can be changed into a prime (66873999015821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38370704 + ... + 40075664.

It is an arithmetic number, because the mean of its divisors is an integer number (568284294144).

It is a 1-persistent number, because it is pandigital, but 2⋅66873999015824 = 133747998031648 is not.

Almost surely, 2^{66873999015824} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66873999015824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90925487063040).

66873999015824 is an abundant number, since it is smaller than the sum of its proper divisors (114976975110256).

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

66873999015824 is a wasteful number, since it uses less digits than its factorization.

66873999015824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705110 (or 1705104 counting only the distinct ones).

The product of its (nonzero) digits is 1410877440, while the sum is 77.

The spelling of 66873999015824 in words is "sixty-six trillion, eight hundred seventy-three billion, nine hundred ninety-nine million, fifteen thousand, eight hundred twenty-four".