66850800 has 240 divisors, whose sum is σ = 236636640. Its totient is φ = 16056320.

The previous prime is 66850793. The next prime is 66850801. The reversal of 66850800 is 805866.

It is a tau number, because it is divible by the number of its divisors (240).

It is a zygodrome in base 2 and base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66850801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 591544 + ... + 591656.

It is an arithmetic number, because the mean of its divisors is an integer number (985986).

Almost surely, 2^66850800 is an apocalyptic number.

66850800 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 66850800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118318320).

66850800 is an abundant number, since it is smaller than the sum of its proper divisors (169785840).

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

66850800 is a wasteful number, since it uses less digits than its factorization.

66850800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 66850800 is about 8176.2338518416. The cubic root of 66850800 is about 405.8531019112.

The spelling of 66850800 in words is "sixty-six million, eight hundred fifty thousand, eight hundred".