640146266116646 has 32 divisors (see below), whose sum is σ = 975766236383232. Its totient is φ = 314902796614560.

The previous prime is 640146266116627. The next prime is 640146266116667. The reversal of 640146266116646 is 646611662641046.

It is a Curzon number.

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, 3425401760 + ... + 3425588636.

It is an arithmetic number, because the mean of its divisors is an integer number (30492694886976).

Almost surely, 2^{640146266116646} is an apocalyptic number.

640146266116646 is a deficient number, since it is larger than the sum of its proper divisors (335619970266586).

640146266116646 is a wasteful number, since it uses less digits than its factorization.

640146266116646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218684.

The product of its (nonzero) digits is 35831808, while the sum is 59.

The spelling of 640146266116646 in words is "six hundred forty trillion, one hundred forty-six billion, two hundred sixty-six million, one hundred sixteen thousand, six hundred forty-six".