71666734038735 has 16 divisors (see below), whose sum is σ = 125091026686080. Its totient is φ = 34747507412640.

The previous prime is 71666734038703. The next prime is 71666734038791. The reversal of 71666734038735 is 53783043766617.

It is not a de Polignac number, because 71666734038735 - 2⁵ = 71666734038703 is a prime.

It is a super-2 number, since 2×71666734038735² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217171921165 + ... + 217171921494.

It is an arithmetic number, because the mean of its divisors is an integer number (7818189167880).

Almost surely, 2^{71666734038735} is an apocalyptic number.

71666734038735 is a deficient number, since it is larger than the sum of its proper divisors (53424292647345).

71666734038735 is a wasteful number, since it uses less digits than its factorization.

71666734038735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434343842678.

The product of its (nonzero) digits is 320060160, while the sum is 66.

The spelling of 71666734038735 in words is "seventy-one trillion, six hundred sixty-six billion, seven hundred thirty-four million, thirty-eight thousand, seven hundred thirty-five".