643240342234 has 16 divisors (see below), whose sum is σ = 1102907454336. Its totient is φ = 275622001200.

The previous prime is 643240342211. The next prime is 643240342237. The reversal of 643240342234 is 432243042346.

It is a happy number.

It is a super-2 number, since 2×643240342234² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643240342193 and 643240342202.

It is not an unprimeable number, because it can be changed into a prime (643240342237) 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 7 ways as a sum of consecutive naturals, for example, 4292982 + ... + 4440289.

It is an arithmetic number, because the mean of its divisors is an integer number (68931715896).

Almost surely, 2^643240342234 is an apocalyptic number.

643240342234 is a deficient number, since it is larger than the sum of its proper divisors (459667112102).

643240342234 is a wasteful number, since it uses less digits than its factorization.

643240342234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8738541.

The product of its (nonzero) digits is 331776, while the sum is 37.

The spelling of 643240342234 in words is "six hundred forty-three billion, two hundred forty million, three hundred forty-two thousand, two hundred thirty-four".