664270241 has 4 divisors (see below), whose sum is σ = 664321812. Its totient is φ = 664218672.

The previous prime is 664270141. The next prime is 664270261. The reversal of 664270241 is 142072466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 142072466 = 2 ⋅71036233.

It can be written as a sum of positive squares in 2 ways, for example, as 532686400 + 131583841 = 23080^2 + 11471^2 .

It is a cyclic number.

It is not a de Polignac number, because 664270241 - 2¹⁴ = 664253857 is a prime.

It is a super-3 number, since 3×664270241³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664270198 and 664270207.

It is not an unprimeable number, because it can be changed into a prime (664270261) 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, 11735 + ... + 38291.

It is an arithmetic number, because the mean of its divisors is an integer number (166080453).

Almost surely, 2^664270241 is an apocalyptic number.

It is an amenable number.

664270241 is a deficient number, since it is larger than the sum of its proper divisors (51571).

664270241 is a wasteful number, since it uses less digits than its factorization.

664270241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51570.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 664270241 is about 25773.4406123824. The cubic root of 664270241 is about 872.5324726901.

The spelling of 664270241 in words is "six hundred sixty-four million, two hundred seventy thousand, two hundred forty-one".