71668644099 has 16 divisors (see below), whose sum is σ = 102914972832. Its totient is φ = 44101145088.

The previous prime is 71668644077. The next prime is 71668644127. The reversal of 71668644099 is 99044686617.

It is a Cunningham number, because it is equal to 267710²-1.

It is not a de Polignac number, because 71668644099 - 2²⁰ = 71667595523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71668644029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758509 + ... + 847745.

It is an arithmetic number, because the mean of its divisors is an integer number (6432185802).

Almost surely, 2^71668644099 is an apocalyptic number.

71668644099 is a deficient number, since it is larger than the sum of its proper divisors (31246328733).

71668644099 is a wasteful number, since it uses less digits than its factorization.

71668644099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109846.

The product of its (nonzero) digits is 15676416, while the sum is 60.

The spelling of 71668644099 in words is "seventy-one billion, six hundred sixty-eight million, six hundred forty-four thousand, ninety-nine".