71666615105055 has 32 divisors (see below), whose sum is σ = 127407875774400. Its totient is φ = 38222026713216.

The previous prime is 71666615105047. The next prime is 71666615105081. The reversal of 71666615105055 is 55050151666617.

It is not a de Polignac number, because 71666615105055 - 2³ = 71666615105047 is a prime.

It is a super-2 number, since 2×71666615105055² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71666615104992 and 71666615105010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33449317 + ... + 35527313.

It is an arithmetic number, because the mean of its divisors is an integer number (3981496117950).

Almost surely, 2^{71666615105055} is an apocalyptic number.

71666615105055 is a deficient number, since it is larger than the sum of its proper divisors (55741260669345).

71666615105055 is a wasteful number, since it uses less digits than its factorization.

71666615105055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333480 (or 2333474 counting only the distinct ones).

The product of its (nonzero) digits is 5670000, while the sum is 54.

The spelling of 71666615105055 in words is "seventy-one trillion, six hundred sixty-six billion, six hundred fifteen million, one hundred five thousand, fifty-five".