665506020 has 48 divisors (see below), whose sum is σ = 1865299968. Its totient is φ = 177288960.

The previous prime is 665506019. The next prime is 665506031. The reversal of 665506020 is 20605566.

665506020 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 (30).

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, 60765 + ... + 70875.

It is an arithmetic number, because the mean of its divisors is an integer number (38860416).

Almost surely, 2^665506020 is an apocalyptic number.

665506020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665506020 is an abundant number, since it is smaller than the sum of its proper divisors (1199793948).

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

665506020 is a wasteful number, since it uses less digits than its factorization.

665506020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11220 (or 11218 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 665506020 is about 25797.4033577025. The cubic root of 665506020 is about 873.0732111240.

The spelling of 665506020 in words is "six hundred sixty-five million, five hundred six thousand, twenty".