20773725697 has 2 divisors, whose sum is σ = 20773725698. Its totient is φ = 20773725696.

The previous prime is 20773725631. The next prime is 20773725703. The reversal of 20773725697 is 79652737702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19655759601 + 1117966096 = 140199^2 + 33436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20773725697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20773725617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386862848 + 10386862849.

It is an arithmetic number, because the mean of its divisors is an integer number (10386862849).

Almost surely, 2^20773725697 is an apocalyptic number.

It is an amenable number.

20773725697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773725697 is an equidigital number, since it uses as much as digits as its factorization.

20773725697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7779240, while the sum is 55.

The spelling of 20773725697 in words is "twenty billion, seven hundred seventy-three million, seven hundred twenty-five thousand, six hundred ninety-seven".