667789201 has 4 divisors (see below), whose sum is σ = 677756272. Its totient is φ = 657822132.

The previous prime is 667789147. The next prime is 667789217. The reversal of 667789201 is 102987766.

It is a happy number.

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 not a de Polignac number, because 667789201 - 2¹⁵ = 667756433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667789231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4983435 + ... + 4983568.

It is an arithmetic number, because the mean of its divisors is an integer number (169439068).

Almost surely, 2^667789201 is an apocalyptic number.

It is an amenable number.

667789201 is a deficient number, since it is larger than the sum of its proper divisors (9967071).

667789201 is an equidigital number, since it uses as much as digits as its factorization.

667789201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9967070.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 667789201 is about 25841.6176157763. The cubic root of 667789201 is about 874.0705018297.

The spelling of 667789201 in words is "six hundred sixty-seven million, seven hundred eighty-nine thousand, two hundred one".