71878087817 has 2 divisors, whose sum is σ = 71878087818. Its totient is φ = 71878087816.

The previous prime is 71878087811. The next prime is 71878087823.

71878087817 is nontrivially palindromic in base 10.

It is a balanced prime because it is at equal distance from previous prime (71878087811) and next prime (71878087823).

It can be written as a sum of positive squares in only one way, i.e., 52806201616 + 19071886201 = 229796^2 + 138101^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71878087817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71878087817.

It is not a weakly prime, because it can be changed into another prime (71878087811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35939043908 + 35939043909.

It is an arithmetic number, because the mean of its divisors is an integer number (35939043909).

Almost surely, 2^71878087817 is an apocalyptic number.

It is an amenable number.

71878087817 is a deficient number, since it is larger than the sum of its proper divisors (1).

71878087817 is an equidigital number, since it uses as much as digits as its factorization.

71878087817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9834496, while the sum is 62.

The spelling of 71878087817 in words is "seventy-one billion, eight hundred seventy-eight million, eighty-seven thousand, eight hundred seventeen".