646633165 has 24 divisors (see below), whose sum is σ = 826755912. Its totient is φ = 485422080.

The previous prime is 646633157. The next prime is 646633171. The reversal of 646633165 is 561336646.

646633165 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 73222249 + 573410916 = 8557^2 + 23946^2 .

It is not a de Polignac number, because 646633165 - 2³ = 646633157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 954807 + ... + 955483.

It is an arithmetic number, because the mean of its divisors is an integer number (34448163).

Almost surely, 2^646633165 is an apocalyptic number.

It is an amenable number.

646633165 is a deficient number, since it is larger than the sum of its proper divisors (180122747).

646633165 is a wasteful number, since it uses less digits than its factorization.

646633165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1360 counting only the distinct ones).

The product of its digits is 233280, while the sum is 40.

The square root of 646633165 is about 25428.9827755654. The cubic root of 646633165 is about 864.7408826598.

The spelling of 646633165 in words is "six hundred forty-six million, six hundred thirty-three thousand, one hundred sixty-five".