71721710673 has 8 divisors (see below), whose sum is σ = 98926497600. Its totient is φ = 46165698768.

The previous prime is 71721710657. The next prime is 71721710677. The reversal of 71721710673 is 37601712717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71721710673 - 2⁴ = 71721710657 is a prime.

It is a super-2 number, since 2×71721710673² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71721710677) 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 7 ways as a sum of consecutive naturals, for example, 412193653 + ... + 412193826.

It is an arithmetic number, because the mean of its divisors is an integer number (12365812200).

Almost surely, 2^71721710673 is an apocalyptic number.

It is an amenable number.

71721710673 is a deficient number, since it is larger than the sum of its proper divisors (27204786927).

71721710673 is a wasteful number, since it uses less digits than its factorization.

71721710673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824387511.

The product of its (nonzero) digits is 86436, while the sum is 42.

The spelling of 71721710673 in words is "seventy-one billion, seven hundred twenty-one million, seven hundred ten thousand, six hundred seventy-three".