665560000201 has 4 divisors (see below), whose sum is σ = 667686390292. Its totient is φ = 663433610112.

The previous prime is 665560000187. The next prime is 665560000207. The reversal of 665560000201 is 102000065566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26398125625 + 639161874576 = 162475^2 + 799476^2 .

It is a cyclic number.

It is not a de Polignac number, because 665560000201 - 2¹⁹ = 665559475913 is a prime.

It is a super-2 number, since 2×665560000201² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665560000207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063194576 + ... + 1063195201.

It is an arithmetic number, because the mean of its divisors is an integer number (166921597573).

Almost surely, 2^665560000201 is an apocalyptic number.

It is an amenable number.

665560000201 is a deficient number, since it is larger than the sum of its proper divisors (2126390091).

665560000201 is a wasteful number, since it uses less digits than its factorization.

665560000201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126390090.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 665560000201 its reverse (102000065566), we get a palindrome (767560065767).

The spelling of 665560000201 in words is "six hundred sixty-five billion, five hundred sixty million, two hundred one", and thus it is an aban number.