643123462641605 has 8 divisors (see below), whose sum is σ = 841907078367264. Its totient is φ = 467726154648400.

The previous prime is 643123462641593. The next prime is 643123462641691. The reversal of 643123462641605 is 506146264321346.

643123462641605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 643123462641605 - 2³² = 643119167674309 is a prime.

It is a Duffinian number.

It is a congruent 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, 5846576933051 + ... + 5846576933160.

It is an arithmetic number, because the mean of its divisors is an integer number (105238384795908).

Almost surely, 2^{643123462641605} is an apocalyptic number.

It is an amenable number.

643123462641605 is a deficient number, since it is larger than the sum of its proper divisors (198783615725659).

643123462641605 is a wasteful number, since it uses less digits than its factorization.

643123462641605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11693153866227.

The product of its (nonzero) digits is 14929920, while the sum is 53.

The spelling of 643123462641605 in words is "six hundred forty-three trillion, one hundred twenty-three billion, four hundred sixty-two million, six hundred forty-one thousand, six hundred five".