667555201 has 4 divisors (see below), whose sum is σ = 706823172. Its totient is φ = 628287232.

The previous prime is 667555181. The next prime is 667555211. The reversal of 667555201 is 102555766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102555766 = 2 ⋅51277883.

It can be written as a sum of positive squares in 2 ways, for example, as 335768976 + 331786225 = 18324^2 + 18215^2 .

It is a cyclic number.

It is not a de Polignac number, because 667555201 - 2⁵ = 667555169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667555211) 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 3 ways as a sum of consecutive naturals, for example, 19633960 + ... + 19633993.

It is an arithmetic number, because the mean of its divisors is an integer number (176705793).

Almost surely, 2^667555201 is an apocalyptic number.

It is an amenable number.

667555201 is a deficient number, since it is larger than the sum of its proper divisors (39267971).

667555201 is a wasteful number, since it uses less digits than its factorization.

667555201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39267970.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 667555201 is about 25837.0896387345. The cubic root of 667555201 is about 873.9683955603.

The spelling of 667555201 in words is "six hundred sixty-seven million, five hundred fifty-five thousand, two hundred one".