71256673847 has 4 divisors (see below), whose sum is σ = 71259545616. Its totient is φ = 71253802080.

The previous prime is 71256673843. The next prime is 71256673849. The reversal of 71256673847 is 74837665217.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71256673847 - 2² = 71256673843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71256673792 and 71256673801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71256673843) 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 in 3 ways as a sum of consecutive naturals, for example, 1398338 + ... + 1448399.

It is an arithmetic number, because the mean of its divisors is an integer number (17814886404).

Almost surely, 2^71256673847 is an apocalyptic number.

71256673847 is a deficient number, since it is larger than the sum of its proper divisors (2871769).

71256673847 is a wasteful number, since it uses less digits than its factorization.

71256673847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871768.

The product of its digits is 11854080, while the sum is 56.

The spelling of 71256673847 in words is "seventy-one billion, two hundred fifty-six million, six hundred seventy-three thousand, eight hundred forty-seven".