71064431243 has 4 divisors (see below), whose sum is σ = 76530925968. Its totient is φ = 65597936520.

The previous prime is 71064431219. The next prime is 71064431281. The reversal of 71064431243 is 34213446017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34213446017 = 4967 ⋅6888151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71064431243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71064431443) 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, 2733247343 + ... + 2733247368.

It is an arithmetic number, because the mean of its divisors is an integer number (19132731492).

Almost surely, 2^71064431243 is an apocalyptic number.

71064431243 is a deficient number, since it is larger than the sum of its proper divisors (5466494725).

71064431243 is a wasteful number, since it uses less digits than its factorization.

71064431243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466494724.

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 71064431243 in words is "seventy-one billion, sixty-four million, four hundred thirty-one thousand, two hundred forty-three".