66483998720 has 416 divisors, whose sum is σ = 178907166720. Its totient is φ = 23616552960.

The previous prime is 66483998699. The next prime is 66483998729. The reversal of 66483998720 is 2789938466.

It is a happy number.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66483998729) 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, 423464882 + ... + 423465038.

Almost surely, 2^66483998720 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 66483998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89453583360).

66483998720 is an abundant number, since it is smaller than the sum of its proper divisors (112423168000).

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

66483998720 is a wasteful number, since it uses less digits than its factorization.

66483998720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 66483998720 in words is "sixty-six billion, four hundred eighty-three million, nine hundred ninety-eight thousand, seven hundred twenty".