664284281 has 4 divisors (see below), whose sum is σ = 666648564. Its totient is φ = 661920000.

The previous prime is 664284277. The next prime is 664284287. The reversal of 664284281 is 182482466.

664284281 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 207821056 + 456463225 = 14416^2 + 21365^2 .

It is a cyclic number.

It is not a de Polignac number, because 664284281 - 2² = 664284277 is a prime.

It is a super-2 number, since 2×664284281² = 882547211967373922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664284287) 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, 1181720 + ... + 1182281.

It is an arithmetic number, because the mean of its divisors is an integer number (166662141).

Almost surely, 2^664284281 is an apocalyptic number.

It is an amenable number.

664284281 is a deficient number, since it is larger than the sum of its proper divisors (2364283).

664284281 is a wasteful number, since it uses less digits than its factorization.

664284281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364282.

The product of its digits is 147456, while the sum is 41.

The square root of 664284281 is about 25773.7129843568. The cubic root of 664284281 is about 872.5386199220.

The spelling of 664284281 in words is "six hundred sixty-four million, two hundred eighty-four thousand, two hundred eighty-one".