75812666281 has 9 divisors (see below), whose sum is σ = 83334607069. Its totient is φ = 68917852300.

The previous prime is 75812666207. The next prime is 75812666323. The reversal of 75812666281 is 18266621857.

It is a happy number.

The square root of 75812666281 is 275341.

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

It is not a de Polignac number, because 75812666281 - 2¹¹ = 75812664233 is a prime.

It is a super-2 number, since 2×75812666281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75812636281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3016236 + ... + 3041266.

Almost surely, 2^75812666281 is an apocalyptic number.

75812666281 is the 275341-st square number.

75812666281 is the 137671-st centered octagonal number.

It is an amenable number.

75812666281 is a deficient number, since it is larger than the sum of its proper divisors (7521940788).

75812666281 is an frugal number, since it uses more digits than its factorization.

75812666281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50084 (or 25042 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 75812666281 in words is "seventy-five billion, eight hundred twelve million, six hundred sixty-six thousand, two hundred eighty-one".