71664444445 has 16 divisors (see below), whose sum is σ = 94301376192. Its totient is φ = 51849538560.

The previous prime is 71664444419. The next prime is 71664444539. The reversal of 71664444445 is 54444446617.

It is not a de Polignac number, because 71664444445 - 2⁵ = 71664444413 is a prime.

It is a super-2 number, since 2×71664444445² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

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, 3365007 + ... + 3386236.

It is an arithmetic number, because the mean of its divisors is an integer number (5893836012).

Almost surely, 2^71664444445 is an apocalyptic number.

It is an amenable number.

71664444445 is a deficient number, since it is larger than the sum of its proper divisors (22636931747).

71664444445 is a wasteful number, since it uses less digits than its factorization.

71664444445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6751452.

The product of its digits is 5160960, while the sum is 49.

The spelling of 71664444445 in words is "seventy-one billion, six hundred sixty-four million, four hundred forty-four thousand, four hundred forty-five".