665665650479 has 2 divisors, whose sum is σ = 665665650480. Its totient is φ = 665665650478.

The previous prime is 665665650451. The next prime is 665665650577. The reversal of 665665650479 is 974056566566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665665650479 - 2¹² = 665665646383 is a prime.

It is a super-3 number, since 3×665665650479³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665665650079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332832825239 + 332832825240.

It is an arithmetic number, because the mean of its divisors is an integer number (332832825240).

Almost surely, 2^665665650479 is an apocalyptic number.

665665650479 is a deficient number, since it is larger than the sum of its proper divisors (1).

665665650479 is an equidigital number, since it uses as much as digits as its factorization.

665665650479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944000, while the sum is 65.

The spelling of 665665650479 in words is "six hundred sixty-five billion, six hundred sixty-five million, six hundred fifty thousand, four hundred seventy-nine".