20087666771 has 2 divisors, whose sum is σ = 20087666772. Its totient is φ = 20087666770.

The previous prime is 20087666759. The next prime is 20087666827. The reversal of 20087666771 is 17766678002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20087666771 is a prime.

It is not a weakly prime, because it can be changed into another prime (20087666971) 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 as a sum of consecutive naturals, namely, 10043833385 + 10043833386.

It is an arithmetic number, because the mean of its divisors is an integer number (10043833386).

Almost surely, 2^20087666771 is an apocalyptic number.

20087666771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20087666771 is an equidigital number, since it uses as much as digits as its factorization.

20087666771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 20087666771 in words is "twenty billion, eighty-seven million, six hundred sixty-six thousand, seven hundred seventy-one".