666867201 has 32 divisors (see below), whose sum is σ = 1193837568. Its totient is φ = 319775040.

The previous prime is 666867199. The next prime is 666867241. The reversal of 666867201 is 102768666.

It is a happy number.

It is not a de Polignac number, because 666867201 - 2¹ = 666867199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666867241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108031 + ... + 114036.

It is an arithmetic number, because the mean of its divisors is an integer number (37307424).

Almost surely, 2^666867201 is an apocalyptic number.

It is an amenable number.

666867201 is a deficient number, since it is larger than the sum of its proper divisors (526970367).

666867201 is a wasteful number, since it uses less digits than its factorization.

666867201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222101.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 666867201 is about 25823.7720133988. The cubic root of 666867201 is about 873.6680473933.

The spelling of 666867201 in words is "six hundred sixty-six million, eight hundred sixty-seven thousand, two hundred one".