71664441867 has 6 divisors (see below), whose sum is σ = 103515304932. Its totient is φ = 47776294572.

The previous prime is 71664441857. The next prime is 71664441971. The reversal of 71664441867 is 76814446617.

It is a happy number.

71664441867 is a `hidden beast` number, since 7 + 16 + 6 + 444 + 186 + 7 = 666.

It is not a de Polignac number, because 71664441867 - 2²⁴ = 71647664651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71664441857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3981357873 + ... + 3981357890.

It is an arithmetic number, because the mean of its divisors is an integer number (17252550822).

Almost surely, 2^71664441867 is an apocalyptic number.

71664441867 is a deficient number, since it is larger than the sum of its proper divisors (31850863065).

71664441867 is a wasteful number, since it uses less digits than its factorization.

71664441867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7962715769 (or 7962715766 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 71664441867 in words is "seventy-one billion, six hundred sixty-four million, four hundred forty-one thousand, eight hundred sixty-seven".