20005111950497 has 2 divisors, whose sum is σ = 20005111950498. Its totient is φ = 20005111950496.

The previous prime is 20005111950491. The next prime is 20005111950503. The reversal of 20005111950497 is 79405911150002.

It is a balanced prime because it is at equal distance from previous prime (20005111950491) and next prime (20005111950503).

It can be written as a sum of positive squares in only one way, i.e., 11505094151056 + 8500017799441 = 3391916^2 + 2915479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20005111950497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20005111950491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002555975248 + 10002555975249.

It is an arithmetic number, because the mean of its divisors is an integer number (10002555975249).

Almost surely, 2^{20005111950497} is an apocalyptic number.

It is an amenable number.

20005111950497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005111950497 is an equidigital number, since it uses as much as digits as its factorization.

20005111950497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 44.

The spelling of 20005111950497 in words is "twenty trillion, five billion, one hundred eleven million, nine hundred fifty thousand, four hundred ninety-seven".