643733276865 has 96 divisors (see below), whose sum is σ = 1251259695360. Its totient is φ = 276783230976.

The previous prime is 643733276833. The next prime is 643733276869. The reversal of 643733276865 is 568672337346.

It is not a de Polignac number, because 643733276865 - 2⁵ = 643733276833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643733276799 and 643733276808.

It is not an unprimeable number, because it can be changed into a prime (643733276869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 51853399 + ... + 51865811.

It is an arithmetic number, because the mean of its divisors is an integer number (13033955160).

Almost surely, 2^643733276865 is an apocalyptic number.

It is an amenable number.

643733276865 is a deficient number, since it is larger than the sum of its proper divisors (607526418495).

643733276865 is a wasteful number, since it uses less digits than its factorization.

643733276865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14171 (or 14154 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 60.

The spelling of 643733276865 in words is "six hundred forty-three billion, seven hundred thirty-three million, two hundred seventy-six thousand, eight hundred sixty-five".