75666255625 has 15 divisors (see below), whose sum is σ = 94561147153. Its totient is φ = 60527503000.

The previous prime is 75666255607. The next prime is 75666255629. The reversal of 75666255625 is 52655266657.

It is a happy number.

The square root of 75666255625 is 275075.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5932234441 + 69734021184 = 77021^2 + 264072^2 .

It is not a de Polignac number, because 75666255625 - 2⁵ = 75666255593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75666255629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6871374 + ... + 6882376.

Almost surely, 2^75666255625 is an apocalyptic number.

75666255625 is the 275075-th square number.

75666255625 is the 137538-th centered octagonal number.

It is an amenable number.

75666255625 is a deficient number, since it is larger than the sum of its proper divisors (18894891528).

75666255625 is an frugal number, since it uses more digits than its factorization.

75666255625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22026 (or 11008 counting only the distinct ones).

The product of its digits is 22680000, while the sum is 55.

The spelling of 75666255625 in words is "seventy-five billion, six hundred sixty-six million, two hundred fifty-five thousand, six hundred twenty-five".