20775471677 has 2 divisors, whose sum is σ = 20775471678. Its totient is φ = 20775471676.

The previous prime is 20775471653. The next prime is 20775471713. The reversal of 20775471677 is 77617457702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20719011481 + 56460196 = 143941^2 + 7514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20775471677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20775471077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387735838 + 10387735839.

It is an arithmetic number, because the mean of its divisors is an integer number (10387735839).

Almost surely, 2^20775471677 is an apocalyptic number.

It is an amenable number.

20775471677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775471677 is an equidigital number, since it uses as much as digits as its factorization.

20775471677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4033680, while the sum is 53.

The spelling of 20775471677 in words is "twenty billion, seven hundred seventy-five million, four hundred seventy-one thousand, six hundred seventy-seven".