20766576109 has 2 divisors, whose sum is σ = 20766576110. Its totient is φ = 20766576108.

The previous prime is 20766576107. The next prime is 20766576139. The reversal of 20766576109 is 90167566702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20641068900 + 125507209 = 143670^2 + 11203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20766576109 - 2¹ = 20766576107 is a prime.

Together with 20766576107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20766576101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383288054 + 10383288055.

It is an arithmetic number, because the mean of its divisors is an integer number (10383288055).

Almost surely, 2^20766576109 is an apocalyptic number.

It is an amenable number.

20766576109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766576109 is an equidigital number, since it uses as much as digits as its factorization.

20766576109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 20766576109 in words is "twenty billion, seven hundred sixty-six million, five hundred seventy-six thousand, one hundred nine".