20517425717527 has 2 divisors, whose sum is σ = 20517425717528. Its totient is φ = 20517425717526.

The previous prime is 20517425717501. The next prime is 20517425717549. The reversal of 20517425717527 is 72571752471502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20517425717527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20517425717927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258712858763 + 10258712858764.

It is an arithmetic number, because the mean of its divisors is an integer number (10258712858764).

Almost surely, 2^{20517425717527} is an apocalyptic number.

20517425717527 is a deficient number, since it is larger than the sum of its proper divisors (1).

20517425717527 is an equidigital number, since it uses as much as digits as its factorization.

20517425717527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9604000, while the sum is 55.

The spelling of 20517425717527 in words is "twenty trillion, five hundred seventeen billion, four hundred twenty-five million, seven hundred seventeen thousand, five hundred twenty-seven".