66256600625 has 10 divisors (see below), whose sum is σ = 82794248922. Its totient is φ = 53005280000.

The previous prime is 66256600577. The next prime is 66256600637. The reversal of 66256600625 is 52600665266.

It can be written as a sum of positive squares in 5 ways, for example, as 39073824241 + 27182776384 = 197671^2 + 164872^2 .

It is not a de Polignac number, because 66256600625 - 2⁶ = 66256600561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 53004656 + ... + 53005905.

Almost surely, 2^66256600625 is an apocalyptic number.

It is an amenable number.

66256600625 is a deficient number, since it is larger than the sum of its proper divisors (16537648297).

66256600625 is an equidigital number, since it uses as much as digits as its factorization.

66256600625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106010581 (or 106010566 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 66256600625 in words is "sixty-six billion, two hundred fifty-six million, six hundred thousand, six hundred twenty-five".