646660014646015 has 16 divisors (see below), whose sum is σ = 782860777758720. Its totient is φ = 512756740208160.

The previous prime is 646660014646001. The next prime is 646660014646033. The reversal of 646660014646015 is 510646410066646.

It is a happy number.

It is not a de Polignac number, because 646660014646015 - 2¹⁹ = 646660014121727 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493216425 + ... + 494525794.

It is an arithmetic number, because the mean of its divisors is an integer number (48928798609920).

Almost surely, 2^{646660014646015} is an apocalyptic number.

646660014646015 is a deficient number, since it is larger than the sum of its proper divisors (136200763112705).

646660014646015 is a wasteful number, since it uses less digits than its factorization.

646660014646015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987743382.

The product of its (nonzero) digits is 14929920, while the sum is 55.

The spelling of 646660014646015 in words is "six hundred forty-six trillion, six hundred sixty billion, fourteen million, six hundred forty-six thousand, fifteen".