66203755800 has 576 divisors, whose sum is σ = 267402528000. Its totient is φ = 13230397440.

The previous prime is 66203755747. The next prime is 66203755811. The reversal of 66203755800 is 855730266.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 13483746 + ... + 13488654.

It is an arithmetic number, because the mean of its divisors is an integer number (464240500).

Almost surely, 2^66203755800 is an apocalyptic number.

66203755800 is a gapful number since it is divisible by the number (60) 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 66203755800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133701264000).

66203755800 is an abundant number, since it is smaller than the sum of its proper divisors (201198772200).

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

66203755800 is a wasteful number, since it uses less digits than its factorization.

66203755800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4980 (or 4958 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 66203755800 in words is "sixty-six billion, two hundred three million, seven hundred fifty-five thousand, eight hundred".