71712012671 has 4 divisors (see below), whose sum is σ = 77228321352. Its totient is φ = 66195703992.

The previous prime is 71712012643. The next prime is 71712012709. The reversal of 71712012671 is 17621021717.

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 71712012671 - 2¹⁰ = 71712011647 is a prime.

It is a super-2 number, since 2×71712012671² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71712062671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2758154321 + ... + 2758154346.

It is an arithmetic number, because the mean of its divisors is an integer number (19307080338).

Almost surely, 2^71712012671 is an apocalyptic number.

71712012671 is a deficient number, since it is larger than the sum of its proper divisors (5516308681).

71712012671 is a wasteful number, since it uses less digits than its factorization.

71712012671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516308680.

The product of its (nonzero) digits is 8232, while the sum is 35.

The spelling of 71712012671 in words is "seventy-one billion, seven hundred twelve million, twelve thousand, six hundred seventy-one".