66143250 has 128 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 17136000.

The previous prime is 66143221. The next prime is 66143257. The reversal of 66143250 is 5234166.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (66143257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 276631 + ... + 276869.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^66143250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66143250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

66143250 is an abundant number, since it is smaller than the sum of its proper divisors (122554350).

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

66143250 is a wasteful number, since it uses less digits than its factorization.

66143250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66143250 is about 8132.8500539479. The cubic root of 66143250 is about 404.4161683786.

The spelling of 66143250 in words is "sixty-six million, one hundred forty-three thousand, two hundred fifty".