665497404 has 192 divisors, whose sum is σ = 2078415360. Its totient is φ = 181440000.

The previous prime is 665497381. The next prime is 665497451. The reversal of 665497404 is 404794566.

665497404 is a `hidden beast` number, since 66 + 549 + 7 + 40 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 665497404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 632679 + ... + 633729.

It is an arithmetic number, because the mean of its divisors is an integer number (10825080).

Almost surely, 2^665497404 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 665497404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039207680).

665497404 is an abundant number, since it is smaller than the sum of its proper divisors (1412917956).

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

665497404 is a wasteful number, since it uses less digits than its factorization.

665497404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 665497404 is about 25797.2363636107. The cubic root of 665497404 is about 873.0694433488.

The spelling of 665497404 in words is "six hundred sixty-five million, four hundred ninety-seven thousand, four hundred four".