6660206620 has 24 divisors (see below), whose sum is σ = 14809166064. Its totient is φ = 2507371776.

The previous prime is 6660206587. The next prime is 6660206621. The reversal of 6660206620 is 266020666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660206621) 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, 9794082 + ... + 9794761.

It is an arithmetic number, because the mean of its divisors is an integer number (617048586).

Almost surely, 2^6660206620 is an apocalyptic number.

It is an amenable number.

6660206620 is an abundant number, since it is smaller than the sum of its proper divisors (8148959444).

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

6660206620 is a wasteful number, since it uses less digits than its factorization.

6660206620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19588869 (or 19588867 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 6660206620 is about 81610.0889596378. The cubic root of 6660206620 is about 1881.4639476326.

The spelling of 6660206620 in words is "six billion, six hundred sixty million, two hundred six thousand, six hundred twenty".