666710570020 has 96 divisors (see below), whose sum is σ = 1542457800576. Its totient is φ = 240050227200.

The previous prime is 666710570017. The next prime is 666710570021. The reversal of 666710570020 is 20075017666.

It is a happy number.

666710570020 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 (666710570021) 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, 25368927 + ... + 25395193.

It is an arithmetic number, because the mean of its divisors is an integer number (16067268756).

Almost surely, 2^666710570020 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 666710570020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (771228900288).

666710570020 is an abundant number, since it is smaller than the sum of its proper divisors (875747230556).

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

666710570020 is a wasteful number, since it uses less digits than its factorization.

666710570020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27421 (or 27419 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

Adding to 666710570020 its reverse (20075017666), we get a palindrome (686785587686).

The spelling of 666710570020 in words is "six hundred sixty-six billion, seven hundred ten million, five hundred seventy thousand, twenty".