665533560 has 64 divisors (see below), whose sum is σ = 2000350080. Its totient is φ = 177142400.

The previous prime is 665533559. The next prime is 665533567. The reversal of 665533560 is 65335566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665533567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62635 + ... + 72485.

It is an arithmetic number, because the mean of its divisors is an integer number (31255470).

Almost surely, 2^665533560 is an apocalyptic number.

665533560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665533560 is an abundant number, since it is smaller than the sum of its proper divisors (1334816520).

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

665533560 is a wasteful number, since it uses less digits than its factorization.

665533560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428 (or 10424 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 39.

The square root of 665533560 is about 25797.9371268324. The cubic root of 665533560 is about 873.0852541428.

The spelling of 665533560 in words is "six hundred sixty-five million, five hundred thirty-three thousand, five hundred sixty".