71508649673 has 2 divisors, whose sum is σ = 71508649674. Its totient is φ = 71508649672.

The previous prime is 71508649633. The next prime is 71508649697. The reversal of 71508649673 is 37694680517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58686031504 + 12822618169 = 242252^2 + 113237^2 .

It is a cyclic number.

It is not a de Polignac number, because 71508649673 - 2¹² = 71508645577 is a prime.

It is a super-2 number, since 2×71508649673² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71508649633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35754324836 + 35754324837.

It is an arithmetic number, because the mean of its divisors is an integer number (35754324837).

Almost surely, 2^71508649673 is an apocalyptic number.

It is an amenable number.

71508649673 is a deficient number, since it is larger than the sum of its proper divisors (1).

71508649673 is an equidigital number, since it uses as much as digits as its factorization.

71508649673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 71508649673 in words is "seventy-one billion, five hundred eight million, six hundred forty-nine thousand, six hundred seventy-three".