666825500 has 96 divisors (see below), whose sum is σ = 1640411136. Its totient is φ = 234600000.

The previous prime is 666825461. The next prime is 666825521. The reversal of 666825500 is 5528666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168545 + ... + 172455.

It is an arithmetic number, because the mean of its divisors is an integer number (17087616).

Almost surely, 2^666825500 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 666825500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820205568).

666825500 is an abundant number, since it is smaller than the sum of its proper divisors (973585636).

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

666825500 is a wasteful number, since it uses less digits than its factorization.

666825500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972 (or 3960 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 666825500 is about 25822.9645858100. The cubic root of 666825500 is about 873.6498360759.

The spelling of 666825500 in words is "six hundred sixty-six million, eight hundred twenty-five thousand, five hundred".