664499471 has 2 divisors, whose sum is σ = 664499472. Its totient is φ = 664499470.

The previous prime is 664499467. The next prime is 664499497. The reversal of 664499471 is 174994466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664499471 - 2² = 664499467 is a prime.

It is a super-3 number, since 3×664499471³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664499441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332249735 + 332249736.

It is an arithmetic number, because the mean of its divisors is an integer number (332249736).

Almost surely, 2^664499471 is an apocalyptic number.

664499471 is a deficient number, since it is larger than the sum of its proper divisors (1).

664499471 is an equidigital number, since it uses as much as digits as its factorization.

664499471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 664499471 is about 25777.8872485702. The cubic root of 664499471 is about 872.6328272365.

The spelling of 664499471 in words is "six hundred sixty-four million, four hundred ninety-nine thousand, four hundred seventy-one".