643063611655 has 16 divisors (see below), whose sum is σ = 812347816320. Its totient is φ = 487340363808.

The previous prime is 643063611629. The next prime is 643063611667. The reversal of 643063611655 is 556116360346.

It is a happy number.

It is not a de Polignac number, because 643063611655 - 2⁷ = 643063611527 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, 1168804 + ... + 1628566.

It is an arithmetic number, because the mean of its divisors is an integer number (50771738520).

Almost surely, 2^643063611655 is an apocalyptic number.

643063611655 is a deficient number, since it is larger than the sum of its proper divisors (169284204665).

643063611655 is a wasteful number, since it uses less digits than its factorization.

643063611655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474510.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 643063611655 in words is "six hundred forty-three billion, sixty-three million, six hundred eleven thousand, six hundred fifty-five".