668144201 has 4 divisors (see below), whose sum is σ = 668970900. Its totient is φ = 667317504.

The previous prime is 668144173. The next prime is 668144203. The reversal of 668144201 is 102441866.

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 501760000 + 166384201 = 22400^2 + 12899^2 .

It is a cyclic number.

It is not a de Polignac number, because 668144201 - 2¹⁸ = 667882057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668144203) 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, 412136 + ... + 413753.

It is an arithmetic number, because the mean of its divisors is an integer number (167242725).

Almost surely, 2^668144201 is an apocalyptic number.

It is an amenable number.

668144201 is a deficient number, since it is larger than the sum of its proper divisors (826699).

668144201 is an equidigital number, since it uses as much as digits as its factorization.

668144201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826698.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 668144201 is about 25848.4854682049. The cubic root of 668144201 is about 874.2253611072.

The spelling of 668144201 in words is "six hundred sixty-eight million, one hundred forty-four thousand, two hundred one".