664306457 has 4 divisors (see below), whose sum is σ = 664498020. Its totient is φ = 664114896.

The previous prime is 664306439. The next prime is 664306463. The reversal of 664306457 is 754603466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754603466 = 2 ⋅377301733.

It can be written as a sum of positive squares in 2 ways, for example, as 207244816 + 457061641 = 14396^2 + 21379^2 .

It is a cyclic number.

It is not a de Polignac number, because 664306457 - 2¹² = 664302361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664306417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90482 + ... + 97547.

It is an arithmetic number, because the mean of its divisors is an integer number (166124505).

Almost surely, 2^664306457 is an apocalyptic number.

It is an amenable number.

664306457 is a deficient number, since it is larger than the sum of its proper divisors (191563).

664306457 is a wasteful number, since it uses less digits than its factorization.

664306457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191562.

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 664306457 is about 25774.1431865348. The cubic root of 664306457 is about 872.5483292195.

The spelling of 664306457 in words is "six hundred sixty-four million, three hundred six thousand, four hundred fifty-seven".