75243781636 has 9 divisors (see below), whose sum is σ = 131677577941. Its totient is φ = 37621616512.

The previous prime is 75243781631. The next prime is 75243781643. The reversal of 75243781636 is 63618734257.

The square root of 75243781636 is 274306.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 50234256900 + 25009524736 = 224130^2 + 158144^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75243781631) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 480036 + ... + 617188.

Almost surely, 2^75243781636 is an apocalyptic number.

75243781636 is the 274306-th square number.

It is an amenable number.

75243781636 is a deficient number, since it is larger than the sum of its proper divisors (56433796305).

75243781636 is an frugal number, since it uses more digits than its factorization.

75243781636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274310 (or 137155 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 52.

The spelling of 75243781636 in words is "seventy-five billion, two hundred forty-three million, seven hundred eighty-one thousand, six hundred thirty-six".