643422224346 has 64 divisors (see below), whose sum is σ = 1486584078336. Its totient is φ = 183485561600.

The previous prime is 643422224321. The next prime is 643422224377.

643422224346 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 = 643422224298 and 643422224307.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11104711 + ... + 11162501.

It is an arithmetic number, because the mean of its divisors is an integer number (23227876224).

Almost surely, 2^643422224346 is an apocalyptic number.

643422224346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

643422224346 is an abundant number, since it is smaller than the sum of its proper divisors (843161853990).

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

643422224346 is a wasteful number, since it uses less digits than its factorization.

643422224346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67747.

The product of its digits is 1327104, while the sum is 42.

It can be divided in two parts, 643422 and 224346, that added together give a palindrome (867768).

The spelling of 643422224346 in words is "six hundred forty-three billion, four hundred twenty-two million, two hundred twenty-four thousand, three hundred forty-six".