66240864129888 has 240 divisors, whose sum is σ = 226292791896864. Its totient is φ = 18615699210240.

The previous prime is 66240864129857. The next prime is 66240864129907. The reversal of 66240864129888 is 88892146804266.

66240864129888 is a `hidden beast` number, since 6 + 6 + 2 + 40 + 8 + 6 + 412 + 98 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28818145 + ... + 31031712.

Almost surely, 2^{66240864129888} is an apocalyptic number.

It is an amenable number.

66240864129888 is an abundant number, since it is smaller than the sum of its proper divisors (160051927766976).

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

66240864129888 is a wasteful number, since it uses less digits than its factorization.

66240864129888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59849947 (or 59849930 counting only the distinct ones).

The product of its (nonzero) digits is 509607936, while the sum is 72.

The spelling of 66240864129888 in words is "sixty-six trillion, two hundred forty billion, eight hundred sixty-four million, one hundred twenty-nine thousand, eight hundred eighty-eight".