666038201 has 4 divisors (see below), whose sum is σ = 669525504. Its totient is φ = 662550900.

The previous prime is 666038173. The next prime is 666038213. The reversal of 666038201 is 102830666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666038201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666038281) 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, 1743365 + ... + 1743746.

It is an arithmetic number, because the mean of its divisors is an integer number (167381376).

Almost surely, 2^666038201 is an apocalyptic number.

It is an amenable number.

666038201 is a deficient number, since it is larger than the sum of its proper divisors (3487303).

666038201 is a wasteful number, since it uses less digits than its factorization.

666038201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3487302.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 666038201 is about 25807.7159198562. The cubic root of 666038201 is about 873.3058707672.

Adding to 666038201 its reverse (102830666), we get a palindrome (768868867).

The spelling of 666038201 in words is "six hundred sixty-six million, thirty-eight thousand, two hundred one".