643351334542 has 32 divisors (see below), whose sum is σ = 1167048705024. Its totient is φ = 260019513600.

The previous prime is 643351334539. The next prime is 643351334543. The reversal of 643351334542 is 245433153346.

It is a super-3 number, since 3×643351334542³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643351334543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14047459 + ... + 14093182.

It is an arithmetic number, because the mean of its divisors is an integer number (36470272032).

Almost surely, 2^643351334542 is an apocalyptic number.

643351334542 is a deficient number, since it is larger than the sum of its proper divisors (523697370482).

643351334542 is a wasteful number, since it uses less digits than its factorization.

643351334542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28140744.

The product of its digits is 1555200, while the sum is 43.

Adding to 643351334542 its reverse (245433153346), we get a palindrome (888784487888).

The spelling of 643351334542 in words is "six hundred forty-three billion, three hundred fifty-one million, three hundred thirty-four thousand, five hundred forty-two".