20555765759 has 2 divisors, whose sum is σ = 20555765760. Its totient is φ = 20555765758.

The previous prime is 20555765687. The next prime is 20555765803. The reversal of 20555765759 is 95756755502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20555765759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20555765359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277882879 + 10277882880.

It is an arithmetic number, because the mean of its divisors is an integer number (10277882880).

Almost surely, 2^20555765759 is an apocalyptic number.

20555765759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20555765759 is an equidigital number, since it uses as much as digits as its factorization.

20555765759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16537500, while the sum is 56.

The spelling of 20555765759 in words is "twenty billion, five hundred fifty-five million, seven hundred sixty-five thousand, seven hundred fifty-nine".