643366663346 has 64 divisors (see below), whose sum is σ = 1125682790400. Its totient is φ = 272703024000.

The previous prime is 643366663337. The next prime is 643366663349.

643366663346 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643366663291 and 643366663300.

It is not an unprimeable number, because it can be changed into a prime (643366663349) 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 31 ways as a sum of consecutive naturals, for example, 8257271 + ... + 8334821.

It is an arithmetic number, because the mean of its divisors is an integer number (17588793600).

Almost surely, 2^643366663346 is an apocalyptic number.

643366663346 is a deficient number, since it is larger than the sum of its proper divisors (482316127054).

643366663346 is a wasteful number, since it uses less digits than its factorization.

643366663346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77895.

The product of its digits is 60466176, while the sum is 56.

The spelling of 643366663346 in words is "six hundred forty-three billion, three hundred sixty-six million, six hundred sixty-three thousand, three hundred forty-six".