6820130666 has 4 divisors (see below), whose sum is σ = 10230196002. Its totient is φ = 3410065332.

The previous prime is 6820130663. The next prime is 6820130671. The reversal of 6820130666 is 6660310286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3940198441 + 2879932225 = 62771^2 + 53665^2 .

It is not an unprimeable number, because it can be changed into a prime (6820130663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1705032665 + ... + 1705032668.

Almost surely, 2^6820130666 is an apocalyptic number.

6820130666 is a deficient number, since it is larger than the sum of its proper divisors (3410065336).

6820130666 is a wasteful number, since it uses less digits than its factorization.

6820130666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410065335.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 6820130666 is about 82584.0824009082. The cubic root of 6820130666 is about 1896.4041561370.

The spelling of 6820130666 in words is "six billion, eight hundred twenty million, one hundred thirty thousand, six hundred sixty-six".