71042618813 has 4 divisors (see below), whose sum is σ = 71088483900. Its totient is φ = 70996753728.

The previous prime is 71042618791. The next prime is 71042618839. The reversal of 71042618813 is 31881624017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42980338489 + 28062280324 = 207317^2 + 167518^2 .

It is a cyclic number.

It is not a de Polignac number, because 71042618813 - 2⁸ = 71042618557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71042618893) 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, 22930220 + ... + 22933317.

It is an arithmetic number, because the mean of its divisors is an integer number (17772120975).

Almost surely, 2^71042618813 is an apocalyptic number.

It is an amenable number.

71042618813 is a deficient number, since it is larger than the sum of its proper divisors (45865087).

71042618813 is a wasteful number, since it uses less digits than its factorization.

71042618813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45865086.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 71042618813 in words is "seventy-one billion, forty-two million, six hundred eighteen thousand, eight hundred thirteen".