71056506617 has 8 divisors (see below), whose sum is σ = 71159430720. Its totient is φ = 70953627600.

The previous prime is 71056506533. The next prime is 71056506637. The reversal of 71056506617 is 71660565017.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71056506617 is a prime.

It is a super-2 number, since 2×71056506617² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71056506637) 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 7 ways as a sum of consecutive naturals, for example, 4271438 + ... + 4288040.

It is an arithmetic number, because the mean of its divisors is an integer number (8894928840).

Almost surely, 2^71056506617 is an apocalyptic number.

It is an amenable number.

71056506617 is a deficient number, since it is larger than the sum of its proper divisors (102924103).

71056506617 is a wasteful number, since it uses less digits than its factorization.

71056506617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22543.

The product of its (nonzero) digits is 264600, while the sum is 44.

The spelling of 71056506617 in words is "seventy-one billion, fifty-six million, five hundred six thousand, six hundred seventeen".