71966672721 has 12 divisors (see below), whose sum is σ = 107801929872. Its totient is φ = 47977781652.

The previous prime is 71966672689. The next prime is 71966672731. The reversal of 71966672721 is 12727666917.

It is not a de Polignac number, because 71966672721 - 2⁵ = 71966672689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71966672731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148079331 + ... + 148079816.

It is an arithmetic number, because the mean of its divisors is an integer number (8983494156).

Almost surely, 2^71966672721 is an apocalyptic number.

It is an amenable number.

71966672721 is a deficient number, since it is larger than the sum of its proper divisors (35835257151).

71966672721 is an equidigital number, since it uses as much as digits as its factorization.

71966672721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296159162 (or 296159150 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 71966672721 in words is "seventy-one billion, nine hundred sixty-six million, six hundred seventy-two thousand, seven hundred twenty-one".