20766165911 has 2 divisors, whose sum is σ = 20766165912. Its totient is φ = 20766165910.

The previous prime is 20766165887. The next prime is 20766165943. The reversal of 20766165911 is 11956166702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20766165911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20766165991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383082955 + 10383082956.

It is an arithmetic number, because the mean of its divisors is an integer number (10383082956).

Almost surely, 2^20766165911 is an apocalyptic number.

20766165911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766165911 is an equidigital number, since it uses as much as digits as its factorization.

20766165911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 20766165911 in words is "twenty billion, seven hundred sixty-six million, one hundred sixty-five thousand, nine hundred eleven".