66520292800 has 504 divisors, whose sum is σ = 194527170000. Its totient is φ = 22274703360.

The previous prime is 66520292767. The next prime is 66520292803. The reversal of 66520292800 is 829202566.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520292803) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 133306951 + ... + 133307449.

Almost surely, 2^66520292800 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 66520292800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97263585000).

66520292800 is an abundant number, since it is smaller than the sum of its proper divisors (128006877200).

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

66520292800 is a wasteful number, since it uses less digits than its factorization.

66520292800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 66520292800 in words is "sixty-six billion, five hundred twenty million, two hundred ninety-two thousand, eight hundred".