71521722693 has 12 divisors (see below), whose sum is σ = 103519567008. Its totient is φ = 47584035240.

The previous prime is 71521722683. The next prime is 71521722709. The reversal of 71521722693 is 39622712517.

It is a happy number.

It is not a de Polignac number, because 71521722693 - 2⁵ = 71521722661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71521722653) 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, 8088105 + ... + 8096942.

It is an arithmetic number, because the mean of its divisors is an integer number (8626630584).

Almost surely, 2^71521722693 is an apocalyptic number.

It is an amenable number.

71521722693 is a deficient number, since it is larger than the sum of its proper divisors (31997844315).

71521722693 is a wasteful number, since it uses less digits than its factorization.

71521722693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16185544 (or 16185541 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The spelling of 71521722693 in words is "seventy-one billion, five hundred twenty-one million, seven hundred twenty-two thousand, six hundred ninety-three".