666724201 has 16 divisors (see below), whose sum is σ = 804460608. Its totient is φ = 544363200.

The previous prime is 666724183. The next prime is 666724229. The reversal of 666724201 is 102427666.

It is a cyclic number.

It is not a de Polignac number, because 666724201 - 2⁹ = 666723689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666724291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57715 + ... + 68296.

It is an arithmetic number, because the mean of its divisors is an integer number (50278788).

Almost surely, 2^666724201 is an apocalyptic number.

It is an amenable number.

666724201 is a deficient number, since it is larger than the sum of its proper divisors (137736407).

666724201 is a wasteful number, since it uses less digits than its factorization.

666724201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126072.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 666724201 is about 25821.0030982532. The cubic root of 666724201 is about 873.6055944482.

The spelling of 666724201 in words is "six hundred sixty-six million, seven hundred twenty-four thousand, two hundred one".