665220620 has 24 divisors (see below), whose sum is σ = 1407632688. Its totient is φ = 264056000.

The previous prime is 665220617. The next prime is 665220629. The reversal of 665220620 is 26022566.

665220620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (665220629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124331 + ... + 129570.

It is an arithmetic number, because the mean of its divisors is an integer number (58651362).

Almost surely, 2^665220620 is an apocalyptic number.

It is an amenable number.

665220620 is an abundant number, since it is smaller than the sum of its proper divisors (742412068).

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

665220620 is a wasteful number, since it uses less digits than its factorization.

665220620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254041 (or 254039 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 665220620 is about 25791.8712000506. The cubic root of 665220620 is about 872.9483884503.

It can be divided in two parts, 6652 and 20620, that added together give a palindrome (27272).

The spelling of 665220620 in words is "six hundred sixty-five million, two hundred twenty thousand, six hundred twenty".