66243205776384 has 1056 divisors, whose sum is σ = 246305523260160. Its totient is φ = 17315458449408.

The previous prime is 66243205776379. The next prime is 66243205776413. The reversal of 66243205776384 is 48367750234266.

66243205776384 is a `hidden beast` number, since 6 + 6 + 2 + 4 + 3 + 20 + 577 + 6 + 38 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2558726512 + ... + 2558752400.

Almost surely, 2^{66243205776384} is an apocalyptic number.

66243205776384 is a gapful number since it is divisible by the number (64) 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 66243205776384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123152761630080).

66243205776384 is an abundant number, since it is smaller than the sum of its proper divisors (180062317483776).

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

66243205776384 is a wasteful number, since it uses less digits than its factorization.

66243205776384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26057 (or 26027 counting only the distinct ones).

The product of its (nonzero) digits is 243855360, while the sum is 63.

The spelling of 66243205776384 in words is "sixty-six trillion, two hundred forty-three billion, two hundred five million, seven hundred seventy-six thousand, three hundred eighty-four".