665646463 has 2 divisors, whose sum is σ = 665646464. Its totient is φ = 665646462.

The previous prime is 665646431. The next prime is 665646479. The reversal of 665646463 is 364646566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665646463 - 2⁵ = 665646431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665646263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332823231 + 332823232.

It is an arithmetic number, because the mean of its divisors is an integer number (332823232).

Almost surely, 2^665646463 is an apocalyptic number.

665646463 is a deficient number, since it is larger than the sum of its proper divisors (1).

665646463 is an equidigital number, since it uses as much as digits as its factorization.

665646463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 46.

The square root of 665646463 is about 25800.1252516340. The cubic root of 665646463 is about 873.1346222372.

The spelling of 665646463 in words is "six hundred sixty-five million, six hundred forty-six thousand, four hundred sixty-three".