665359170 has 64 divisors (see below), whose sum is σ = 1842103296. Its totient is φ = 150655680.

The previous prime is 665359159. The next prime is 665359183. The reversal of 665359170 is 71953566.

It is a happy number.

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

It is an unprimeable number.

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, 7665 + ... + 37275.

It is an arithmetic number, because the mean of its divisors is an integer number (28782864).

Almost surely, 2^665359170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665359170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921051648).

665359170 is an abundant number, since it is smaller than the sum of its proper divisors (1176744126).

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

665359170 is a wasteful number, since it uses less digits than its factorization.

665359170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29735.

The product of its (nonzero) digits is 170100, while the sum is 42.

The square root of 665359170 is about 25794.5569839840. The cubic root of 665359170 is about 873.0089891993.

The spelling of 665359170 in words is "six hundred sixty-five million, three hundred fifty-nine thousand, one hundred seventy".