66238840320 has 320 divisors, whose sum is σ = 216833246784. Its totient is φ = 17243832320.

The previous prime is 66238840313. The next prime is 66238840357. The reversal of 66238840320 is 2304883266.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143684890 + ... + 143685350.

Almost surely, 2^66238840320 is an apocalyptic number.

66238840320 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 66238840320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108416623392).

66238840320 is an abundant number, since it is smaller than the sum of its proper divisors (150594406464).

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

66238840320 is a wasteful number, since it uses less digits than its factorization.

66238840320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The spelling of 66238840320 in words is "sixty-six billion, two hundred thirty-eight million, eight hundred forty thousand, three hundred twenty".