6666740667 has 16 divisors (see below), whose sum is σ = 9954426880. Its totient is φ = 4409495496.

The previous prime is 6666740659. The next prime is 6666740687. The reversal of 6666740667 is 7660476666.

It is not a de Polignac number, because 6666740667 - 2³ = 6666740659 is a prime.

It is a super-2 number, since 2×6666740667² = 88890862242063209778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666740617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 968683 + ... + 975540.

It is an arithmetic number, because the mean of its divisors is an integer number (622151680).

Almost surely, 2^6666740667 is an apocalyptic number.

6666740667 is a deficient number, since it is larger than the sum of its proper divisors (3287686213).

6666740667 is a wasteful number, since it uses less digits than its factorization.

6666740667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944359 (or 1944353 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The square root of 6666740667 is about 81650.1112491587. Note that the first 3 decimals coincide. The cubic root of 6666740667 is about 1882.0790214343.

The spelling of 6666740667 in words is "six billion, six hundred sixty-six million, seven hundred forty thousand, six hundred sixty-seven".