643212666212346 has 32 divisors (see below), whose sum is σ = 1440272636827200. Its totient is φ = 212767548617520.

The previous prime is 643212666212219. The next prime is 643212666212407.

643212666212346 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 643212666212292 and 643212666212301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45463144341 + ... + 45463158488.

It is an arithmetic number, because the mean of its divisors is an integer number (45008519900850).

Almost surely, 2^{643212666212346} is an apocalyptic number.

643212666212346 is an abundant number, since it is smaller than the sum of its proper divisors (797059970614854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643212666212346 is a wasteful number, since it uses less digits than its factorization.

643212666212346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90926302971 (or 90926302965 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 54.

The spelling of 643212666212346 in words is "six hundred forty-three trillion, two hundred twelve billion, six hundred sixty-six million, two hundred twelve thousand, three hundred forty-six".