66650225 has 12 divisors (see below), whose sum is σ = 83381196. Its totient is φ = 52846080.

The previous prime is 66650219. The next prime is 66650257. The reversal of 66650225 is 52205666.

It can be written as a sum of positive squares in 6 ways, for example, as 28815424 + 37834801 = 5368^2 + 6151^2 .

It is not a de Polignac number, because 66650225 - 2⁶ = 66650161 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66650191 and 66650200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8972 + ... + 14621.

It is an arithmetic number, because the mean of its divisors is an integer number (6948433).

Almost surely, 2^66650225 is an apocalyptic number.

It is an amenable number.

66650225 is a deficient number, since it is larger than the sum of its proper divisors (16730971).

66650225 is a wasteful number, since it uses less digits than its factorization.

66650225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23716 (or 23711 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 66650225 is about 8163.9589048451. The cubic root of 66650225 is about 405.4467964516.

The spelling of 66650225 in words is "sixty-six million, six hundred fifty thousand, two hundred twenty-five".