664514471 has 2 divisors, whose sum is σ = 664514472. Its totient is φ = 664514470.

The previous prime is 664514449. The next prime is 664514503. The reversal of 664514471 is 174415466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664514471 is a prime.

It is a super-3 number, since 3×664514471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664514441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332257235 + 332257236.

It is an arithmetic number, because the mean of its divisors is an integer number (332257236).

Almost surely, 2^664514471 is an apocalyptic number.

664514471 is a deficient number, since it is larger than the sum of its proper divisors (1).

664514471 is an equidigital number, since it uses as much as digits as its factorization.

664514471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 664514471 is about 25778.1781939686. The cubic root of 664514471 is about 872.6393932783.

The spelling of 664514471 in words is "six hundred sixty-four million, five hundred fourteen thousand, four hundred seventy-one".