665061330 has 64 divisors (see below), whose sum is σ = 1669248000. Its totient is φ = 169262016.

The previous prime is 665061289. The next prime is 665061359. The reversal of 665061330 is 33160566.

It is a super-2 number, since 2×665061330² = 884613145322737800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442921 + ... + 444419.

It is an arithmetic number, because the mean of its divisors is an integer number (26082000).

Almost surely, 2^665061330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665061330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834624000).

665061330 is an abundant number, since it is smaller than the sum of its proper divisors (1004186670).

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

665061330 is a wasteful number, since it uses less digits than its factorization.

665061330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 665061330 is about 25788.7830267347. The cubic root of 665061330 is about 872.8787057792.

The spelling of 665061330 in words is "six hundred sixty-five million, sixty-one thousand, three hundred thirty".