66850625 has 10 divisors (see below), whose sum is σ = 83537322. Its totient is φ = 53480000.

The previous prime is 66850621. The next prime is 66850631. The reversal of 66850625 is 52605866.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 36192256 + 30658369 = 6016^2 + 5537^2 .

It is not a de Polignac number, because 66850625 - 2² = 66850621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66850621) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 52856 + ... + 54105.

Almost surely, 2^66850625 is an apocalyptic number.

It is an amenable number.

66850625 is a deficient number, since it is larger than the sum of its proper divisors (16686697).

66850625 is an equidigital number, since it uses as much as digits as its factorization.

66850625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106981 (or 106966 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 66850625 is about 8176.2231500859. The cubic root of 66850625 is about 405.8527477675.

The spelling of 66850625 in words is "sixty-six million, eight hundred fifty thousand, six hundred twenty-five".