71813831817 has 16 divisors (see below), whose sum is σ = 117848339840. Its totient is φ = 37879823232.

The previous prime is 71813831813. The next prime is 71813831857.

71813831817 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 71813831817 - 2² = 71813831813 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (71813831813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131526892 + ... + 131527437.

It is an arithmetic number, because the mean of its divisors is an integer number (7365521240).

Almost surely, 2^71813831817 is an apocalyptic number.

It is an amenable number.

71813831817 is a deficient number, since it is larger than the sum of its proper divisors (46034508023).

71813831817 is a wasteful number, since it uses less digits than its factorization.

71813831817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263054352.

The product of its digits is 225792, while the sum is 48.

The spelling of 71813831817 in words is "seventy-one billion, eight hundred thirteen million, eight hundred thirty-one thousand, eight hundred seventeen".