646303604165 has 8 divisors (see below), whose sum is σ = 775590580728. Its totient is φ = 517025379520.

The previous prime is 646303604159. The next prime is 646303604171. The reversal of 646303604165 is 561406303646.

It is an interprime number because it is at equal distance from previous prime (646303604159) and next prime (646303604171).

It can be written as a sum of positive squares in 4 ways, for example, as 168282089284 + 478021514881 = 410222^2 + 691391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-646303604165 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2024402 + ... + 2321811.

It is an arithmetic number, because the mean of its divisors is an integer number (96948822591).

Almost surely, 2^646303604165 is an apocalyptic number.

It is an amenable number.

646303604165 is a deficient number, since it is larger than the sum of its proper divisors (129286976563).

646303604165 is a wasteful number, since it uses less digits than its factorization.

646303604165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375959.

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 646303604165 in words is "six hundred forty-six billion, three hundred three million, six hundred four thousand, one hundred sixty-five".