664232261 has 16 divisors (see below), whose sum is σ = 830860800. Its totient is φ = 515879280.

The previous prime is 664232227. The next prime is 664232263. The reversal of 664232261 is 162232466.

664232261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664232261 - 2⁶ = 664232197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664232263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9590 + ... + 37688.

It is an arithmetic number, because the mean of its divisors is an integer number (51928800).

Almost surely, 2^664232261 is an apocalyptic number.

It is an amenable number.

664232261 is a deficient number, since it is larger than the sum of its proper divisors (166628539).

664232261 is a wasteful number, since it uses less digits than its factorization.

664232261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28424.

The product of its digits is 20736, while the sum is 32.

The square root of 664232261 is about 25772.7037968468. The cubic root of 664232261 is about 872.5158432057.

The spelling of 664232261 in words is "six hundred sixty-four million, two hundred thirty-two thousand, two hundred sixty-one".