665846479 has 2 divisors, whose sum is σ = 665846480. Its totient is φ = 665846478.

The previous prime is 665846383. The next prime is 665846513. The reversal of 665846479 is 974648566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665846479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665844479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332923239 + 332923240.

It is an arithmetic number, because the mean of its divisors is an integer number (332923240).

Almost surely, 2^665846479 is an apocalyptic number.

665846479 is a deficient number, since it is larger than the sum of its proper divisors (1).

665846479 is an equidigital number, since it uses as much as digits as its factorization.

665846479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 55.

The square root of 665846479 is about 25804.0012207409. The cubic root of 665846479 is about 873.2220677582. Note that the first 3 decimals are identical.

The spelling of 665846479 in words is "six hundred sixty-five million, eight hundred forty-six thousand, four hundred seventy-nine".