664687201 has 4 divisors (see below), whose sum is σ = 666956052. Its totient is φ = 662418352.

The previous prime is 664687187. The next prime is 664687211. The reversal of 664687201 is 102786466.

664687201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 578643025 + 86044176 = 24055^2 + 9276^2 .

It is a cyclic number.

It is not a de Polignac number, because 664687201 - 2⁵ = 664687169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664687211) 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, 1133986 + ... + 1134571.

It is an arithmetic number, because the mean of its divisors is an integer number (166739013).

Almost surely, 2^664687201 is an apocalyptic number.

It is an amenable number.

664687201 is a deficient number, since it is larger than the sum of its proper divisors (2268851).

664687201 is a wasteful number, since it uses less digits than its factorization.

664687201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268850.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 664687201 is about 25781.5282906192. The cubic root of 664687201 is about 872.7149963192.

The spelling of 664687201 in words is "six hundred sixty-four million, six hundred eighty-seven thousand, two hundred one".