66603361 has 6 divisors (see below), whose sum is σ = 73208786. Its totient is φ = 60548400.

The previous prime is 66603353. The next prime is 66603373. The reversal of 66603361 is 16330666.

66603361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 62726400 + 3876961 = 7920^2 + 1969^2 .

It is not a de Polignac number, because 66603361 - 2³ = 66603353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66603301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275100 + ... + 275341.

Almost surely, 2^66603361 is an apocalyptic number.

It is an amenable number.

66603361 is a deficient number, since it is larger than the sum of its proper divisors (6605425).

66603361 is a wasteful number, since it uses less digits than its factorization.

66603361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550463 (or 550452 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 66603361 is about 8161.0882240054. The cubic root of 66603361 is about 405.3517464409.

The spelling of 66603361 in words is "sixty-six million, six hundred three thousand, three hundred sixty-one".