71811517223 has 8 divisors (see below), whose sum is σ = 71869736400. Its totient is φ = 71753326848.

The previous prime is 71811517201. The next prime is 71811517301. The reversal of 71811517223 is 32271511817.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 71811517223 - 2¹⁰ = 71811516199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71811517523) 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, 8337143 + ... + 8345751.

It is an arithmetic number, because the mean of its divisors is an integer number (8983717050).

Almost surely, 2^71811517223 is an apocalyptic number.

71811517223 is a deficient number, since it is larger than the sum of its proper divisors (58219177).

71811517223 is a wasteful number, since it uses less digits than its factorization.

71811517223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14401.

The product of its digits is 23520, while the sum is 38.

The spelling of 71811517223 in words is "seventy-one billion, eight hundred eleven million, five hundred seventeen thousand, two hundred twenty-three".