665372760 has 128 divisors (see below), whose sum is σ = 2177280000. Its totient is φ = 161680896.

The previous prime is 665372753. The next prime is 665372767. The reversal of 665372760 is 67273566.

It is an interprime number because it is at equal distance from previous prime (665372753) and next prime (665372767).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665372767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120541 + ... + 125939.

It is an arithmetic number, because the mean of its divisors is an integer number (17010000).

Almost surely, 2^665372760 is an apocalyptic number.

665372760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665372760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640000).

665372760 is an abundant number, since it is smaller than the sum of its proper divisors (1511907240).

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

665372760 is a wasteful number, since it uses less digits than its factorization.

665372760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505 (or 5501 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 42.

The square root of 665372760 is about 25794.8204103072. The cubic root of 665372760 is about 873.0149329120.

The spelling of 665372760 in words is "six hundred sixty-five million, three hundred seventy-two thousand, seven hundred sixty".