66573032500 has 240 divisors, whose sum is σ = 164175846912. Its totient is φ = 23448960000.

The previous prime is 66573032443. The next prime is 66573032501. The reversal of 66573032500 is 523037566.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66573032500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66573032501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 62626969 + ... + 62628031.

Almost surely, 2^66573032500 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 66573032500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82087923456).

66573032500 is an abundant number, since it is smaller than the sum of its proper divisors (97602814412).

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

66573032500 is a wasteful number, since it uses less digits than its factorization.

66573032500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188 (or 1171 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 37.

The spelling of 66573032500 in words is "sixty-six billion, five hundred seventy-three million, thirty-two thousand, five hundred".