643204254023665 has 8 divisors (see below), whose sum is σ = 805403587647168. Its totient is φ = 492191081339760.

The previous prime is 643204254023657. The next prime is 643204254023713. The reversal of 643204254023665 is 566320452402346.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643204254023665 - 2³ = 643204254023657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2796540234771 + ... + 2796540235000.

It is an arithmetic number, because the mean of its divisors is an integer number (100675448455896).

Almost surely, 2^{643204254023665} is an apocalyptic number.

It is an amenable number.

643204254023665 is a deficient number, since it is larger than the sum of its proper divisors (162199333623503).

643204254023665 is a wasteful number, since it uses less digits than its factorization.

643204254023665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5593080469799.

The product of its (nonzero) digits is 24883200, while the sum is 52.

The spelling of 643204254023665 in words is "six hundred forty-three trillion, two hundred four billion, two hundred fifty-four million, twenty-three thousand, six hundred sixty-five".