643310420042 has 16 divisors (see below), whose sum is σ = 976458944832. Its totient is φ = 317834616960.

The previous prime is 643310420029. The next prime is 643310420047. The reversal of 643310420042 is 240024013346.

It is a super-2 number, since 2×643310420042² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643310419987 and 643310420014.

It is not an unprimeable number, because it can be changed into a prime (643310420047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2505188 + ... + 2750015.

It is an arithmetic number, because the mean of its divisors is an integer number (61028684052).

Almost surely, 2^643310420042 is an apocalyptic number.

643310420042 is a deficient number, since it is larger than the sum of its proper divisors (333148524790).

643310420042 is a wasteful number, since it uses less digits than its factorization.

643310420042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255933.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 643310420042 its reverse (240024013346), we get a palindrome (883334433388).

The spelling of 643310420042 in words is "six hundred forty-three billion, three hundred ten million, four hundred twenty thousand, forty-two".