666755250 has 96 divisors (see below), whose sum is σ = 1936037376. Its totient is φ = 152392800.

The previous prime is 666755213. The next prime is 666755251. The reversal of 666755250 is 52557666.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (666755251) 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 47 ways as a sum of consecutive naturals, for example, 27679 + ... + 45821.

It is an arithmetic number, because the mean of its divisors is an integer number (20167056).

Almost surely, 2^666755250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666755250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968018688).

666755250 is an abundant number, since it is smaller than the sum of its proper divisors (1269282126).

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

666755250 is a wasteful number, since it uses less digits than its factorization.

666755250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18177 (or 18160 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 42.

The square root of 666755250 is about 25821.6043266099. The cubic root of 666755250 is about 873.6191553574.

The spelling of 666755250 in words is "six hundred sixty-six million, seven hundred fifty-five thousand, two hundred fifty".