666425201 has 4 divisors (see below), whose sum is σ = 717688692. Its totient is φ = 615161712.

The previous prime is 666425189. The next prime is 666425213. The reversal of 666425201 is 102524666.

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

It is an interprime number because it is at equal distance from previous prime (666425189) and next prime (666425213).

It can be written as a sum of positive squares in 2 ways, for example, as 389036176 + 277389025 = 19724^2 + 16655^2 .

It is a cyclic number.

It is not a de Polignac number, because 666425201 - 2²⁶ = 599316337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666425281) 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, 25631726 + ... + 25631751.

It is an arithmetic number, because the mean of its divisors is an integer number (179422173).

Almost surely, 2^666425201 is an apocalyptic number.

It is an amenable number.

666425201 is a deficient number, since it is larger than the sum of its proper divisors (51263491).

666425201 is a wasteful number, since it uses less digits than its factorization.

666425201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51263490.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 666425201 is about 25815.2125887044. The cubic root of 666425201 is about 873.4749821554.

Adding to 666425201 its reverse (102524666), we get a palindrome (768949867).

The spelling of 666425201 in words is "six hundred sixty-six million, four hundred twenty-five thousand, two hundred one".