20187667104389 has 2 divisors, whose sum is σ = 20187667104390. Its totient is φ = 20187667104388.

The previous prime is 20187667104361. The next prime is 20187667104457. The reversal of 20187667104389 is 98340176678102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19363960202500 + 823706901889 = 4400450^2 + 907583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20187667104389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20187667104089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10093833552194 + 10093833552195.

It is an arithmetic number, because the mean of its divisors is an integer number (10093833552195).

Almost surely, 2^{20187667104389} is an apocalyptic number.

It is an amenable number.

20187667104389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20187667104389 is an equidigital number, since it uses as much as digits as its factorization.

20187667104389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 20187667104389 in words is "twenty trillion, one hundred eighty-seven billion, six hundred sixty-seven million, one hundred four thousand, three hundred eighty-nine".