66237824840 has 192 divisors, whose sum is σ = 168123438000. Its totient is φ = 23459870720.

The previous prime is 66237824831. The next prime is 66237824857. The reversal of 66237824840 is 4842873266.

It can be written as a sum of positive squares in 8 ways, for example, as 20066988964 + 46170835876 = 141658^2 + 214874^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38220614 + ... + 38222346.

Almost surely, 2^66237824840 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 66237824840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84061719000).

66237824840 is an abundant number, since it is smaller than the sum of its proper divisors (101885613160).

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

66237824840 is a wasteful number, since it uses less digits than its factorization.

66237824840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 50.

The spelling of 66237824840 in words is "sixty-six billion, two hundred thirty-seven million, eight hundred twenty-four thousand, eight hundred forty".