665349000 has 128 divisors (see below), whose sum is σ = 2092970880. Its totient is φ = 175968000.

The previous prime is 665348989. The next prime is 665349007. The reversal of 665349000 is 943566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665349007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 392154 + ... + 393846.

It is an arithmetic number, because the mean of its divisors is an integer number (16351335).

Almost surely, 2^665349000 is an apocalyptic number.

665349000 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 665349000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046485440).

665349000 is an abundant number, since it is smaller than the sum of its proper divisors (1427621880).

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

665349000 is a wasteful number, since it uses less digits than its factorization.

665349000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 665349000 is about 25794.3598486181. The cubic root of 665349000 is about 873.0045412023.

The spelling of 665349000 in words is "six hundred sixty-five million, three hundred forty-nine thousand".