71729837845 has 4 divisors (see below), whose sum is σ = 86075805420. Its totient is φ = 57383870272.

The previous prime is 71729837833. The next prime is 71729837873. The reversal of 71729837845 is 54873892717.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17440371844 + 54289466001 = 132062^2 + 233001^2 .

It is a cyclic number.

It is not a de Polignac number, because 71729837845 - 2²³ = 71721449237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7172983780 + ... + 7172983789.

It is an arithmetic number, because the mean of its divisors is an integer number (21518951355).

Almost surely, 2^71729837845 is an apocalyptic number.

It is an amenable number.

71729837845 is a deficient number, since it is larger than the sum of its proper divisors (14345967575).

71729837845 is a wasteful number, since it uses less digits than its factorization.

71729837845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14345967574.

The product of its digits is 23708160, while the sum is 61.

The spelling of 71729837845 in words is "seventy-one billion, seven hundred twenty-nine million, eight hundred thirty-seven thousand, eight hundred forty-five".