71006806491 has 8 divisors (see below), whose sum is σ = 94755507264. Its totient is φ = 47297988360.

The previous prime is 71006806487. The next prime is 71006806531. The reversal of 71006806491 is 19460860017.

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

It is not a de Polignac number, because 71006806491 - 2² = 71006806487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71006806411) 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, 9966505 + ... + 9973626.

It is an arithmetic number, because the mean of its divisors is an integer number (11844438408).

Almost surely, 2^71006806491 is an apocalyptic number.

71006806491 is a deficient number, since it is larger than the sum of its proper divisors (23748700773).

71006806491 is a wasteful number, since it uses less digits than its factorization.

71006806491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19941321.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 71006806491 in words is "seventy-one billion, six million, eight hundred six thousand, four hundred ninety-one".