20065502557 has 2 divisors, whose sum is σ = 20065502558. Its totient is φ = 20065502556.

The previous prime is 20065502533. The next prime is 20065502563. The reversal of 20065502557 is 75520556002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14533266916 + 5532235641 = 120554^2 + 74379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20065502557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20065502057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10032751278 + 10032751279.

It is an arithmetic number, because the mean of its divisors is an integer number (10032751279).

Almost surely, 2^20065502557 is an apocalyptic number.

It is an amenable number.

20065502557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20065502557 is an equidigital number, since it uses as much as digits as its factorization.

20065502557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 37.

The spelling of 20065502557 in words is "twenty billion, sixty-five million, five hundred two thousand, five hundred fifty-seven".