71444357865 has 12 divisors (see below), whose sum is σ = 123836887044. Its totient is φ = 38103657504.

The previous prime is 71444357851. The next prime is 71444357869. The reversal of 71444357865 is 56875344417.

71444357865 is a `hidden beast` number, since 7 + 1 + 4 + 4 + 4 + 3 + 578 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10999185129 + 60445172736 = 104877^2 + 245856^2 .

It is not a de Polignac number, because 71444357865 - 2⁷ = 71444357737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71444357869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793826154 + ... + 793826243.

It is an arithmetic number, because the mean of its divisors is an integer number (10319740587).

Almost surely, 2^71444357865 is an apocalyptic number.

It is an amenable number.

71444357865 is a deficient number, since it is larger than the sum of its proper divisors (52392529179).

71444357865 is a wasteful number, since it uses less digits than its factorization.

71444357865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587652408 (or 1587652405 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 54.

The spelling of 71444357865 in words is "seventy-one billion, four hundred forty-four million, three hundred fifty-seven thousand, eight hundred sixty-five".