71666734038733 has 4 divisors (see below), whose sum is σ = 71706928507168. Its totient is φ = 71626539570300.

The previous prime is 71666734038703. The next prime is 71666734038791. The reversal of 71666734038733 is 33783043766617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71666734038733 - 2²⁹ = 71666197167821 is a prime.

It is a super-2 number, since 2×71666734038733² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71666734038703) 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, 20097231543 + ... + 20097235108.

It is an arithmetic number, because the mean of its divisors is an integer number (17926732126792).

Almost surely, 2^{71666734038733} is an apocalyptic number.

It is an amenable number.

71666734038733 is a deficient number, since it is larger than the sum of its proper divisors (40194468435).

71666734038733 is a wasteful number, since it uses less digits than its factorization.

71666734038733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40194468434.

The product of its (nonzero) digits is 192036096, while the sum is 64.

The spelling of 71666734038733 in words is "seventy-one trillion, six hundred sixty-six billion, seven hundred thirty-four million, thirty-eight thousand, seven hundred thirty-three".