665250460 has 144 divisors (see below), whose sum is σ = 1747466784. Its totient is φ = 211341312.

The previous prime is 665250451. The next prime is 665250473. The reversal of 665250460 is 64052566.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 1215907 + ... + 1216453.

It is an arithmetic number, because the mean of its divisors is an integer number (12135186).

Almost surely, 2^665250460 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 665250460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (873733392).

665250460 is an abundant number, since it is smaller than the sum of its proper divisors (1082216324).

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

665250460 is a wasteful number, since it uses less digits than its factorization.

665250460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 665250460 is about 25792.4496703977. The cubic root of 665250460 is about 872.9614409573.

The spelling of 665250460 in words is "six hundred sixty-five million, two hundred fifty thousand, four hundred sixty".