665042250 has 64 divisors (see below), whose sum is σ = 1664208000. Its totient is φ = 176889600.

The previous prime is 665042207. The next prime is 665042267. The reversal of 665042250 is 52240566.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 373362 + ... + 375138.

It is an arithmetic number, because the mean of its divisors is an integer number (26003250).

Almost surely, 2^665042250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665042250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (832104000).

665042250 is an abundant number, since it is smaller than the sum of its proper divisors (999165750).

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

665042250 is a wasteful number, since it uses less digits than its factorization.

665042250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 2286 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 665042250 is about 25788.4130958072. The cubic root of 665042250 is about 872.8703583360.

The spelling of 665042250 in words is "six hundred sixty-five million, forty-two thousand, two hundred fifty".