646464959959 has 64 divisors (see below), whose sum is σ = 835713849600. Its totient is φ = 486296358912.

The previous prime is 646464959929. The next prime is 646464959977. The reversal of 646464959959 is 959959464646.

It is not a de Polignac number, because 646464959959 - 2⁷ = 646464959831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646464959929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 136584357 + ... + 136589089.

It is an arithmetic number, because the mean of its divisors is an integer number (13058028900).

Almost surely, 2^646464959959 is an apocalyptic number.

646464959959 is a deficient number, since it is larger than the sum of its proper divisors (189248889641).

646464959959 is a wasteful number, since it uses less digits than its factorization.

646464959959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564.

The product of its digits is 2267481600, while the sum is 76.

The spelling of 646464959959 in words is "six hundred forty-six billion, four hundred sixty-four million, nine hundred fifty-nine thousand, nine hundred fifty-nine".