71056206661 has 8 divisors (see below), whose sum is σ = 78314995584. Its totient is φ = 63930606720.

The previous prime is 71056206659. The next prime is 71056206677. The reversal of 71056206661 is 16660265017.

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

It is a cyclic number.

It is not a de Polignac number, because 71056206661 - 2¹ = 71056206659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71056201661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33296125 + ... + 33298258.

It is an arithmetic number, because the mean of its divisors is an integer number (9789374448).

Almost surely, 2^71056206661 is an apocalyptic number.

It is an amenable number.

71056206661 is a deficient number, since it is larger than the sum of its proper divisors (7258788923).

71056206661 is a wasteful number, since it uses less digits than its factorization.

71056206661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66594491.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 71056206661 in words is "seventy-one billion, fifty-six million, two hundred six thousand, six hundred sixty-one".