643266606554 has 16 divisors (see below), whose sum is σ = 1133588705760. Its totient is φ = 269902072560.

The previous prime is 643266606529. The next prime is 643266606569. The reversal of 643266606554 is 455606662346.

It is a junction number, because it is equal to n+sod(n) for n = 643266606496 and 643266606505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1124591684 + ... + 1124592255.

It is an arithmetic number, because the mean of its divisors is an integer number (70849294110).

Almost surely, 2^643266606554 is an apocalyptic number.

643266606554 is a deficient number, since it is larger than the sum of its proper divisors (490322099206).

643266606554 is a wasteful number, since it uses less digits than its factorization.

643266606554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249183965.

The product of its (nonzero) digits is 18662400, while the sum is 53.

The spelling of 643266606554 in words is "six hundred forty-three billion, two hundred sixty-six million, six hundred six thousand, five hundred fifty-four".