71855409589697 has 2 divisors, whose sum is σ = 71855409589698. Its totient is φ = 71855409589696.

The previous prime is 71855409589693. The next prime is 71855409589739. The reversal of 71855409589697 is 79698590455817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71736902215696 + 118507374001 = 8469764^2 + 344249^2 .

It is an emirp because it is prime and its reverse (79698590455817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71855409589697 - 2² = 71855409589693 is a prime.

It is not a weakly prime, because it can be changed into another prime (71855409589693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35927704794848 + 35927704794849.

It is an arithmetic number, because the mean of its divisors is an integer number (35927704794849).

Almost surely, 2^{71855409589697} is an apocalyptic number.

It is an amenable number.

71855409589697 is a deficient number, since it is larger than the sum of its proper divisors (1).

71855409589697 is an equidigital number, since it uses as much as digits as its factorization.

71855409589697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432000, while the sum is 83.

The spelling of 71855409589697 in words is "seventy-one trillion, eight hundred fifty-five billion, four hundred nine million, five hundred eighty-nine thousand, six hundred ninety-seven".