20166666666667 has 8 divisors (see below), whose sum is σ = 20202251679792. Its totient is φ = 20131085836800.

The previous prime is 20166666666661. The next prime is 20166666666673. The reversal of 20166666666667 is 76666666666102.

It is an interprime number because it is at equal distance from previous prime (20166666666661) and next prime (20166666666673).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20166666666667 - 2⁷ = 20166666666539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20166666666596 and 20166666666605.

It is not an unprimeable number, because it can be changed into a prime (20166666666661) 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, 8684067 + ... + 10758547.

It is an arithmetic number, because the mean of its divisors is an integer number (2525281459974).

Almost surely, 2^{20166666666667} is an apocalyptic number.

20166666666667 is a deficient number, since it is larger than the sum of its proper divisors (35585013125).

20166666666667 is a wasteful number, since it uses less digits than its factorization.

20166666666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091629.

The product of its (nonzero) digits is 846526464, while the sum is 70.

The spelling of 20166666666667 in words is "twenty trillion, one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".