71661687706 has 16 divisors (see below), whose sum is σ = 129314324160. Its totient is φ = 29095722720.

The previous prime is 71661687703. The next prime is 71661687707. The reversal of 71661687706 is 60778616617.

It is not an unprimeable number, because it can be changed into a prime (71661687703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134702155 + ... + 134702686.

It is an arithmetic number, because the mean of its divisors is an integer number (8082145260).

Almost surely, 2^71661687706 is an apocalyptic number.

71661687706 is a deficient number, since it is larger than the sum of its proper divisors (57652636454).

71661687706 is a wasteful number, since it uses less digits than its factorization.

71661687706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269404869.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 71661687706 in words is "seventy-one billion, six hundred sixty-one million, six hundred eighty-seven thousand, seven hundred six".