665570620 has 96 divisors (see below), whose sum is σ = 1695246336. Its totient is φ = 216172800.

The previous prime is 665570611. The next prime is 665570629. The reversal of 665570620 is 26075566.

665570620 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665570611) and next prime (665570629).

It is a self number, because there is not a number n which added to its sum of digits gives 665570620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665570629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84907 + ... + 92413.

It is an arithmetic number, because the mean of its divisors is an integer number (17658816).

Almost surely, 2^665570620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665570620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847623168).

665570620 is an abundant number, since it is smaller than the sum of its proper divisors (1029675716).

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

665570620 is a wasteful number, since it uses less digits than its factorization.

665570620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7571 (or 7569 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 665570620 is about 25798.6553913184. The cubic root of 665570620 is about 873.1014596561.

The spelling of 665570620 in words is "six hundred sixty-five million, five hundred seventy thousand, six hundred twenty".