646612065 has 56 divisors (see below), whose sum is σ = 1269209088. Its totient is φ = 313489440.

The previous prime is 646612039. The next prime is 646612069. The reversal of 646612065 is 560216646.

It is a happy number.

646612065 is a `hidden beast` number, since 646 + 6 + 1 + 2 + 0 + 6 + 5 = 666.

It is not a de Polignac number, because 646612065 - 2⁷ = 646611937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646612069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 32032 + ... + 48158.

It is an arithmetic number, because the mean of its divisors is an integer number (22664448).

Almost surely, 2^646612065 is an apocalyptic number.

It is an amenable number.

646612065 is a deficient number, since it is larger than the sum of its proper divisors (622597023).

646612065 is a wasteful number, since it uses less digits than its factorization.

646612065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16161 (or 16146 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 646612065 is about 25428.5678912518. The cubic root of 646612065 is about 864.7314768988.

The spelling of 646612065 in words is "six hundred forty-six million, six hundred twelve thousand, sixty-five".