642356433543 has 16 divisors (see below), whose sum is σ = 934364946816. Its totient is φ = 389295131040.

The previous prime is 642356433533. The next prime is 642356433569. The reversal of 642356433543 is 345334653246.

It is not a de Polignac number, because 642356433543 - 2¹⁸ = 642356171399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642356433492 and 642356433501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642356433533) 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, 880321 + ... + 1435157.

It is an arithmetic number, because the mean of its divisors is an integer number (58397809176).

Almost surely, 2^642356433543 is an apocalyptic number.

642356433543 is a deficient number, since it is larger than the sum of its proper divisors (292008513273).

642356433543 is a wasteful number, since it uses less digits than its factorization.

642356433543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589934.

The product of its digits is 9331200, while the sum is 48.

The spelling of 642356433543 in words is "six hundred forty-two billion, three hundred fifty-six million, four hundred thirty-three thousand, five hundred forty-three".