71065947457 has 2 divisors, whose sum is σ = 71065947458. Its totient is φ = 71065947456.

The previous prime is 71065947439. The next prime is 71065947509. The reversal of 71065947457 is 75474956017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67221451441 + 3844496016 = 259271^2 + 62004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71065947457 is a prime.

It is a super-2 number, since 2×71065947457² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71065947398 and 71065947407.

It is not a weakly prime, because it can be changed into another prime (71065944457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35532973728 + 35532973729.

It is an arithmetic number, because the mean of its divisors is an integer number (35532973729).

Almost surely, 2^71065947457 is an apocalyptic number.

It is an amenable number.

71065947457 is a deficient number, since it is larger than the sum of its proper divisors (1).

71065947457 is an equidigital number, since it uses as much as digits as its factorization.

71065947457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7408800, while the sum is 55.

The spelling of 71065947457 in words is "seventy-one billion, sixty-five million, nine hundred forty-seven thousand, four hundred fifty-seven".