664237241 has 4 divisors (see below), whose sum is σ = 664557300. Its totient is φ = 663917184.

The previous prime is 664237219. The next prime is 664237247. The reversal of 664237241 is 142732466.

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 239011600 + 425225641 = 15460^2 + 20621^2 .

It is a cyclic number.

It is not a de Polignac number, because 664237241 - 2⁶ = 664237177 is a prime.

It is a super-2 number, since 2×664237241² = 882422224662584162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664237247) 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, 156896 + ... + 161073.

It is an arithmetic number, because the mean of its divisors is an integer number (166139325).

Almost surely, 2^664237241 is an apocalyptic number.

It is an amenable number.

664237241 is a deficient number, since it is larger than the sum of its proper divisors (320059).

664237241 is a wasteful number, since it uses less digits than its factorization.

664237241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320058.

The product of its digits is 48384, while the sum is 35.

The square root of 664237241 is about 25772.8004105103. The cubic root of 664237241 is about 872.5180237271.

The spelling of 664237241 in words is "six hundred sixty-four million, two hundred thirty-seven thousand, two hundred forty-one".