665195328 has 280 divisors, whose sum is σ = 2354470272. Its totient is φ = 181564416.

The previous prime is 665195309. The next prime is 665195347. The reversal of 665195328 is 823591566.

665195328 is a `hidden beast` number, since 66 + 51 + 9 + 532 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (665195309) and next prime (665195347).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 834226 + ... + 835022.

Almost surely, 2^665195328 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 665195328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177235136).

665195328 is an abundant number, since it is smaller than the sum of its proper divisors (1689274944).

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

665195328 is a wasteful number, since it uses less digits than its factorization.

665195328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 832 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 665195328 is about 25791.3808858696. The cubic root of 665195328 is about 872.9373250077.

The spelling of 665195328 in words is "six hundred sixty-five million, one hundred ninety-five thousand, three hundred twenty-eight".