665613479 has 2 divisors, whose sum is σ = 665613480. Its totient is φ = 665613478.

The previous prime is 665613439. The next prime is 665613497. The reversal of 665613479 is 974316566.

Together with next prime (665613497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665613479 - 2¹² = 665609383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665613439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332806739 + 332806740.

It is an arithmetic number, because the mean of its divisors is an integer number (332806740).

Almost surely, 2^665613479 is an apocalyptic number.

665613479 is a deficient number, since it is larger than the sum of its proper divisors (1).

665613479 is an equidigital number, since it uses as much as digits as its factorization.

665613479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 665613479 is about 25799.4860220121. The cubic root of 665613479 is about 873.1202001930.

The spelling of 665613479 in words is "six hundred sixty-five million, six hundred thirteen thousand, four hundred seventy-nine".