6666740069 has 4 divisors (see below), whose sum is σ = 7272807360. Its totient is φ = 6060672780.

The previous prime is 6666740029. The next prime is 6666740089. The reversal of 6666740069 is 9600476666.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 6666740069 - 2¹² = 6666735973 is a prime.

It is a super-2 number, since 2×6666740069² = 88890846295220249522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6666739999 and 6666740026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666740029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303033629 + ... + 303033650.

It is an arithmetic number, because the mean of its divisors is an integer number (1818201840).

Almost surely, 2^6666740069 is an apocalyptic number.

It is an amenable number.

6666740069 is a deficient number, since it is larger than the sum of its proper divisors (606067291).

6666740069 is a wasteful number, since it uses less digits than its factorization.

6666740069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606067290.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The square root of 6666740069 is about 81650.1075871918. The cubic root of 6666740069 is about 1882.0789651607.

The spelling of 6666740069 in words is "six billion, six hundred sixty-six million, seven hundred forty thousand, sixty-nine".