6620602066 has 16 divisors (see below), whose sum is σ = 10696946904. Its totient is φ = 3055054464.

The previous prime is 6620602063. The next prime is 6620602069. The reversal of 6620602066 is 6602060266.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6620602063) and next prime (6620602069).

It can be written as a sum of positive squares in 4 ways, for example, as 1207910025 + 5412692041 = 34755^2 + 73571^2 .

It is not an unprimeable number, because it can be changed into a prime (6620602061) 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, 124576 + ... + 169588.

Almost surely, 2^6620602066 is an apocalyptic number.

6620602066 is a deficient number, since it is larger than the sum of its proper divisors (4076344838).

6620602066 is a wasteful number, since it uses less digits than its factorization.

6620602066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50685.

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

The square root of 6620602066 is about 81367.0822015881. The cubic root of 6620602066 is about 1877.7271902250.

The spelling of 6620602066 in words is "six billion, six hundred twenty million, six hundred two thousand, sixty-six".