71513878379989 has 2 divisors, whose sum is σ = 71513878379990. Its totient is φ = 71513878379988.

The previous prime is 71513878379963. The next prime is 71513878380013. The reversal of 71513878379989 is 98997387831517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69412509227889 + 2101369152100 = 8331417^2 + 1449610^2 .

It is a cyclic number.

It is not a de Polignac number, because 71513878379989 - 2³³ = 71505288445397 is a prime.

It is a super-2 number, since 2×71513878379989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71513878379929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756939189994 + 35756939189995.

It is an arithmetic number, because the mean of its divisors is an integer number (35756939189995).

Almost surely, 2^{71513878379989} is an apocalyptic number.

It is an amenable number.

71513878379989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71513878379989 is an equidigital number, since it uses as much as digits as its factorization.

71513878379989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5761082880, while the sum is 85.

The spelling of 71513878379989 in words is "seventy-one trillion, five hundred thirteen billion, eight hundred seventy-eight million, three hundred seventy-nine thousand, nine hundred eighty-nine".