665063604 has 72 divisors (see below), whose sum is σ = 1735086080. Its totient is φ = 214633152.

The previous prime is 665063587. The next prime is 665063611. The reversal of 665063604 is 406360566.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295917 + ... + 298155.

Almost surely, 2^665063604 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 665063604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (867543040).

665063604 is an abundant number, since it is smaller than the sum of its proper divisors (1070022476).

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

665063604 is a wasteful number, since it uses less digits than its factorization.

665063604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509 (or 2504 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 665063604 is about 25788.8271156328. The cubic root of 665063604 is about 872.8797006367.

The spelling of 665063604 in words is "six hundred sixty-five million, sixty-three thousand, six hundred four".