71533738643 has 6 divisors (see below), whose sum is σ = 75989127516. Its totient is φ = 67325871392.

The previous prime is 71533738621. The next prime is 71533738681. The reversal of 71533738643 is 34683733517.

It is not a de Polignac number, because 71533738643 - 2⁸ = 71533738387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71533738591 and 71533738600.

It is not an unprimeable number, because it can be changed into a prime (71533738613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123760505 + ... + 123761082.

It is an arithmetic number, because the mean of its divisors is an integer number (12664854586).

Almost surely, 2^71533738643 is an apocalyptic number.

71533738643 is a deficient number, since it is larger than the sum of its proper divisors (4455388873).

71533738643 is a wasteful number, since it uses less digits than its factorization.

71533738643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247521621 (or 247521604 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 50.

The spelling of 71533738643 in words is "seventy-one billion, five hundred thirty-three million, seven hundred thirty-eight thousand, six hundred forty-three".