71018513617 has 2 divisors, whose sum is σ = 71018513618. Its totient is φ = 71018513616.

The previous prime is 71018513567. The next prime is 71018513651. The reversal of 71018513617 is 71631581017.

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., 70662398976 + 356114641 = 265824^2 + 18871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71018513617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71018513617.

It is not a weakly prime, because it can be changed into another prime (71018513677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35509256808 + 35509256809.

It is an arithmetic number, because the mean of its divisors is an integer number (35509256809).

Almost surely, 2^71018513617 is an apocalyptic number.

It is an amenable number.

71018513617 is a deficient number, since it is larger than the sum of its proper divisors (1).

71018513617 is an equidigital number, since it uses as much as digits as its factorization.

71018513617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 40.

The spelling of 71018513617 in words is "seventy-one billion, eighteen million, five hundred thirteen thousand, six hundred seventeen".