66942003520 has 224 divisors, whose sum is σ = 185440320000. Its totient is φ = 22543073280.

The previous prime is 66942003451. The next prime is 66942003523. The reversal of 66942003520 is 2530024966.

It is a tau number, because it is divible by the number of its divisors (224).

It is a self number, because there is not a number n which added to its sum of digits gives 66942003520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66942003523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53595856 + ... + 53597104.

Almost surely, 2^66942003520 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 66942003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92720160000).

66942003520 is an abundant number, since it is smaller than the sum of its proper divisors (118498316480).

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

66942003520 is a wasteful number, since it uses less digits than its factorization.

66942003520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681 (or 1671 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 66942003520 in words is "sixty-six billion, nine hundred forty-two million, three thousand, five hundred twenty".