646321140005163 has 64 divisors (see below), whose sum is σ = 1079454594816000. Its totient is φ = 335399749945344.

The previous prime is 646321140005081. The next prime is 646321140005263. The reversal of 646321140005163 is 361500041123646.

It is a happy number.

It is not a de Polignac number, because 646321140005163 - 2²² = 646321135810859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646321140005263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3881608 + ... + 36162261.

It is an arithmetic number, because the mean of its divisors is an integer number (16866478044000).

Almost surely, 2^{646321140005163} is an apocalyptic number.

646321140005163 is a deficient number, since it is larger than the sum of its proper divisors (433133454810837).

646321140005163 is a wasteful number, since it uses less digits than its factorization.

646321140005163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40045484.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 646321140005163 in words is "six hundred forty-six trillion, three hundred twenty-one billion, one hundred forty million, five thousand, one hundred sixty-three".