665503560 has 64 divisors (see below), whose sum is σ = 2218348800. Its totient is φ = 177467328.

The previous prime is 665503549. The next prime is 665503577. The reversal of 665503560 is 65305566.

It is a happy number.

665503560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307024 + ... + 309183.

It is an arithmetic number, because the mean of its divisors is an integer number (34661700).

Almost surely, 2^665503560 is an apocalyptic number.

665503560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665503560 is an abundant number, since it is smaller than the sum of its proper divisors (1552845240).

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

665503560 is a wasteful number, since it uses less digits than its factorization.

665503560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616227 (or 616217 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 665503560 is about 25797.3556784412. The cubic root of 665503560 is about 873.0721353697.

The spelling of 665503560 in words is "six hundred sixty-five million, five hundred three thousand, five hundred sixty".