6666680069 has 4 divisors (see below), whose sum is σ = 7619062944. Its totient is φ = 5714297196.

The previous prime is 6666680021. The next prime is 6666680087. The reversal of 6666680069 is 9600866666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9600866666 = 2 ⋅4800433333.

It is a cyclic number.

It is not a de Polignac number, because 6666680069 - 2¹⁶ = 6666614533 is a prime.

It is a super-2 number, since 2×6666680069² = 88889246284803689522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666680069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666680099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476191427 + ... + 476191440.

It is an arithmetic number, because the mean of its divisors is an integer number (1904765736).

Almost surely, 2^6666680069 is an apocalyptic number.

It is an amenable number.

6666680069 is a deficient number, since it is larger than the sum of its proper divisors (952382875).

6666680069 is an equidigital number, since it uses as much as digits as its factorization.

6666680069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952382874.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The square root of 6666680069 is about 81649.7401649264. The cubic root of 6666680069 is about 1882.0733189691.

The spelling of 6666680069 in words is "six billion, six hundred sixty-six million, six hundred eighty thousand, sixty-nine".