71387683661851 has 12 divisors (see below), whose sum is σ = 73779575559096. Its totient is φ = 69071014172160.

The previous prime is 71387683661849. The next prime is 71387683661909. The reversal of 71387683661851 is 15816638678317.

It is not a de Polignac number, because 71387683661851 - 2¹ = 71387683661849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71387683667851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2640621 + ... + 12237166.

It is an arithmetic number, because the mean of its divisors is an integer number (6148297963258).

Almost surely, 2^{71387683661851} is an apocalyptic number.

71387683661851 is a deficient number, since it is larger than the sum of its proper divisors (2391891897245).

71387683661851 is a wasteful number, since it uses less digits than its factorization.

71387683661851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14882842 (or 14882811 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 70.

The spelling of 71387683661851 in words is "seventy-one trillion, three hundred eighty-seven billion, six hundred eighty-three million, six hundred sixty-one thousand, eight hundred fifty-one".