666744201 has 6 divisors (see below), whose sum is σ = 963074970. Its totient is φ = 444496128.

The previous prime is 666744163. The next prime is 666744203. The reversal of 666744201 is 102447666.

It can be written as a sum of positive squares in only one way, i.e., 626751225 + 39992976 = 25035^2 + 6324^2 .

It is not a de Polignac number, because 666744201 - 2¹³ = 666736009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666744203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37041336 + ... + 37041353.

It is an arithmetic number, because the mean of its divisors is an integer number (160512495).

Almost surely, 2^666744201 is an apocalyptic number.

It is an amenable number.

666744201 is a deficient number, since it is larger than the sum of its proper divisors (296330769).

666744201 is a wasteful number, since it uses less digits than its factorization.

666744201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74082695 (or 74082692 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 666744201 is about 25821.3903769723. The cubic root of 666744201 is about 873.6143296630.

The spelling of 666744201 in words is "six hundred sixty-six million, seven hundred forty-four thousand, two hundred one".