20773107697 has 2 divisors, whose sum is σ = 20773107698. Its totient is φ = 20773107696.

The previous prime is 20773107623. The next prime is 20773107743. The reversal of 20773107697 is 79670137702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17394708321 + 3378399376 = 131889^2 + 58124^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773107697 - 2¹¹ = 20773105649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20773107697.

It is not a weakly prime, because it can be changed into another prime (20773107097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386553848 + 10386553849.

It is an arithmetic number, because the mean of its divisors is an integer number (10386553849).

Almost surely, 2^20773107697 is an apocalyptic number.

It is an amenable number.

20773107697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773107697 is an equidigital number, since it uses as much as digits as its factorization.

20773107697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777924, while the sum is 49.

The spelling of 20773107697 in words is "twenty billion, seven hundred seventy-three million, one hundred seven thousand, six hundred ninety-seven".