42534643517 has 2 divisors, whose sum is σ = 42534643518. Its totient is φ = 42534643516.

The previous prime is 42534643513. The next prime is 42534643597. The reversal of 42534643517 is 71534643524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42224496196 + 310147321 = 205486^2 + 17611^2 .

It is a cyclic number.

It is not a de Polignac number, because 42534643517 - 2² = 42534643513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42534643513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21267321758 + 21267321759.

It is an arithmetic number, because the mean of its divisors is an integer number (21267321759).

Almost surely, 2^42534643517 is an apocalyptic number.

It is an amenable number.

42534643517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42534643517 is an equidigital number, since it uses as much as digits as its factorization.

42534643517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 44.

The spelling of 42534643517 in words is "forty-two billion, five hundred thirty-four million, six hundred forty-three thousand, five hundred seventeen".