665916528 has 40 divisors (see below), whose sum is σ = 1766783248. Its totient is φ = 215972352.

The previous prime is 665916479. The next prime is 665916569. The reversal of 665916528 is 825619566.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185701 + ... + 189252.

Almost surely, 2^665916528 is an apocalyptic number.

It is an amenable number.

665916528 is an abundant number, since it is smaller than the sum of its proper divisors (1100866720).

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

665916528 is a wasteful number, since it uses less digits than its factorization.

665916528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375001 (or 374995 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 665916528 is about 25805.3585133011. The cubic root of 665916528 is about 873.2526885242.

The spelling of 665916528 in words is "six hundred sixty-five million, nine hundred sixteen thousand, five hundred twenty-eight".