71018745865 has 4 divisors (see below), whose sum is σ = 85222495044. Its totient is φ = 56814996688.

The previous prime is 71018745841. The next prime is 71018745869. The reversal of 71018745865 is 56854781017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56854781017 = 19037 ⋅2986541.

It can be written as a sum of positive squares in 2 ways, for example, as 16295033104 + 54723712761 = 127652^2 + 233931^2 .

It is a cyclic number.

It is not a de Polignac number, because 71018745865 - 2³¹ = 68871262217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71018745869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7101874582 + ... + 7101874591.

It is an arithmetic number, because the mean of its divisors is an integer number (21305623761).

Almost surely, 2^71018745865 is an apocalyptic number.

It is an amenable number.

71018745865 is a deficient number, since it is larger than the sum of its proper divisors (14203749179).

71018745865 is a wasteful number, since it uses less digits than its factorization.

71018745865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14203749178.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 71018745865 in words is "seventy-one billion, eighteen million, seven hundred forty-five thousand, eight hundred sixty-five".