665312471 has 2 divisors, whose sum is σ = 665312472. Its totient is φ = 665312470.

The previous prime is 665312449. The next prime is 665312491. The reversal of 665312471 is 174213566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665312471 - 2¹⁰ = 665311447 is a prime.

It is a super-3 number, since 3×665312471³ (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 (665312441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332656235 + 332656236.

It is an arithmetic number, because the mean of its divisors is an integer number (332656236).

Almost surely, 2^665312471 is an apocalyptic number.

665312471 is a deficient number, since it is larger than the sum of its proper divisors (1).

665312471 is an equidigital number, since it uses as much as digits as its factorization.

665312471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 665312471 is about 25793.6517577485. The cubic root of 665312471 is about 872.9885643408.

The spelling of 665312471 in words is "six hundred sixty-five million, three hundred twelve thousand, four hundred seventy-one".