665469765979 has 2 divisors, whose sum is σ = 665469765980. Its totient is φ = 665469765978.

The previous prime is 665469765971. The next prime is 665469765997. The reversal of 665469765979 is 979567964566.

Together with next prime (665469765997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665469765979 - 2³ = 665469765971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665469765899 and 665469765908.

It is not a weakly prime, because it can be changed into another prime (665469765971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332734882989 + 332734882990.

It is an arithmetic number, because the mean of its divisors is an integer number (332734882990).

Almost surely, 2^665469765979 is an apocalyptic number.

665469765979 is a deficient number, since it is larger than the sum of its proper divisors (1).

665469765979 is an equidigital number, since it uses as much as digits as its factorization.

665469765979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4629441600, while the sum is 79.

The spelling of 665469765979 in words is "six hundred sixty-five billion, four hundred sixty-nine million, seven hundred sixty-five thousand, nine hundred seventy-nine".