66006625 has 8 divisors (see below), whose sum is σ = 82376424. Its totient is φ = 52805200.

The previous prime is 66006617. The next prime is 66006643. The reversal of 66006625 is 52660066.

It can be written as a sum of positive squares in 4 ways, for example, as 10712529 + 55294096 = 3273^2 + 7436^2 .

It is not a de Polignac number, because 66006625 - 2³ = 66006617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263902 + ... + 264151.

It is an arithmetic number, because the mean of its divisors is an integer number (10297053).

Almost surely, 2^66006625 is an apocalyptic number.

It is an amenable number.

66006625 is a deficient number, since it is larger than the sum of its proper divisors (16369799).

66006625 is an equidigital number, since it uses as much as digits as its factorization.

66006625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528068 (or 528058 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66006625 is about 8124.4461349682. The cubic root of 66006625 is about 404.1375234356.

It can be divided in two parts, 6600 and 6625, that added together give a square (13225 = 115²).

The spelling of 66006625 in words is "sixty-six million, six thousand, six hundred twenty-five".