71253757138 has 4 divisors (see below), whose sum is σ = 106880635710. Its totient is φ = 35626878568.

The previous prime is 71253757111. The next prime is 71253757139. The reversal of 71253757138 is 83175735217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83175735217 = 1163 ⋅71518259.

It can be written as a sum of positive squares in only one way, i.e., 71194513329 + 59243809 = 266823^2 + 7697^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71253757091 and 71253757100.

It is not an unprimeable number, because it can be changed into a prime (71253757139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17813439283 + ... + 17813439286.

Almost surely, 2^71253757138 is an apocalyptic number.

71253757138 is a deficient number, since it is larger than the sum of its proper divisors (35626878572).

71253757138 is a wasteful number, since it uses less digits than its factorization.

71253757138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35626878571.

The product of its digits is 1234800, while the sum is 49.

The spelling of 71253757138 in words is "seventy-one billion, two hundred fifty-three million, seven hundred fifty-seven thousand, one hundred thirty-eight".