66243468720 has 320 divisors, whose sum is σ = 241652533248. Its totient is φ = 14799360000.

The previous prime is 66243468667. The next prime is 66243468749. The reversal of 66243468720 is 2786434266.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 66243468720.

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, 28175545 + ... + 28177895.

Almost surely, 2^66243468720 is an apocalyptic number.

66243468720 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 66243468720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120826266624).

66243468720 is an abundant number, since it is smaller than the sum of its proper divisors (175409064528).

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

66243468720 is a wasteful number, since it uses less digits than its factorization.

66243468720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212 (or 3206 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 48.

The spelling of 66243468720 in words is "sixty-six billion, two hundred forty-three million, four hundred sixty-eight thousand, seven hundred twenty".