642356442146543 has 2 divisors, whose sum is σ = 642356442146544. Its totient is φ = 642356442146542.

The previous prime is 642356442146453. The next prime is 642356442146569. The reversal of 642356442146543 is 345641244653246.

Together with previous prime (642356442146453) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642356442146543 - 2¹⁰ = 642356442145519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642356442146843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321178221073271 + 321178221073272.

It is an arithmetic number, because the mean of its divisors is an integer number (321178221073272).

Almost surely, 2^{642356442146543} is an apocalyptic number.

642356442146543 is a deficient number, since it is larger than the sum of its proper divisors (1).

642356442146543 is an equidigital number, since it uses as much as digits as its factorization.

642356442146543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 199065600, while the sum is 59.

Adding to 642356442146543 its reverse (345641244653246), we get a palindrome (987997686799789).

The spelling of 642356442146543 in words is "six hundred forty-two trillion, three hundred fifty-six billion, four hundred forty-two million, one hundred forty-six thousand, five hundred forty-three".