71857875817 has 16 divisors (see below), whose sum is σ = 89316122112. Its totient is φ = 56291659200.

The previous prime is 71857875769. The next prime is 71857875847.

It is a happy number.

71857875817 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 71857875817 - 2⁷ = 71857875689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71857875847) 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, 3899953 + ... + 3918334.

It is an arithmetic number, because the mean of its divisors is an integer number (5582257632).

Almost surely, 2^71857875817 is an apocalyptic number.

It is an amenable number.

71857875817 is a deficient number, since it is larger than the sum of its proper divisors (17458246295).

71857875817 is a wasteful number, since it uses less digits than its factorization.

71857875817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7818408.

The product of its digits is 30732800, while the sum is 64.

The spelling of 71857875817 in words is "seventy-one billion, eight hundred fifty-seven million, eight hundred seventy-five thousand, eight hundred seventeen".