20550115717 has 2 divisors, whose sum is σ = 20550115718. Its totient is φ = 20550115716.

The previous prime is 20550115673. The next prime is 20550115757. The reversal of 20550115717 is 71751105502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14895226116 + 5654889601 = 122046^2 + 75199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20550115717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20550115757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275057858 + 10275057859.

It is an arithmetic number, because the mean of its divisors is an integer number (10275057859).

Almost surely, 2^20550115717 is an apocalyptic number.

It is an amenable number.

20550115717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550115717 is an equidigital number, since it uses as much as digits as its factorization.

20550115717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12250, while the sum is 34.

The spelling of 20550115717 in words is "twenty billion, five hundred fifty million, one hundred fifteen thousand, seven hundred seventeen".