20001666686667 has 8 divisors (see below), whose sum is σ = 27828405825024. Its totient is φ = 12754686003048.

The previous prime is 20001666686647. The next prime is 20001666686671. The reversal of 20001666686667 is 76668666610002.

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

It is not a de Polignac number, because 20001666686667 - 2²⁶ = 20001599577803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001666686667.

It is not an unprimeable number, because it can be changed into a prime (20001666686647) 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, 144939613603 + ... + 144939613740.

It is an arithmetic number, because the mean of its divisors is an integer number (3478550728128).

Almost surely, 2^{20001666686667} is an apocalyptic number.

20001666686667 is a deficient number, since it is larger than the sum of its proper divisors (7826739138357).

20001666686667 is a wasteful number, since it uses less digits than its factorization.

20001666686667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289879227369.

The product of its (nonzero) digits is 31352832, while the sum is 60.

The spelling of 20001666686667 in words is "twenty trillion, one billion, six hundred sixty-six million, six hundred eighty-six thousand, six hundred sixty-seven".