71137344509 has 36 divisors (see below), whose sum is σ = 95897319840. Its totient is φ = 52170894720.

The previous prime is 71137344469. The next prime is 71137344583. The reversal of 71137344509 is 90544373117.

It is not a de Polignac number, because 71137344509 - 2³⁶ = 2417867773 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71137344509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71137340509) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 72569 + ... + 384110.

It is an arithmetic number, because the mean of its divisors is an integer number (2663814440).

Almost surely, 2^71137344509 is an apocalyptic number.

It is an amenable number.

71137344509 is a deficient number, since it is larger than the sum of its proper divisors (24759975331).

71137344509 is a wasteful number, since it uses less digits than its factorization.

71137344509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456738 (or 456714 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 71137344509 in words is "seventy-one billion, one hundred thirty-seven million, three hundred forty-four thousand, five hundred nine".