642754213823 has 2 divisors, whose sum is σ = 642754213824. Its totient is φ = 642754213822.

The previous prime is 642754213781. The next prime is 642754213943. The reversal of 642754213823 is 328312457246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642754213823 - 2¹⁰ = 642754212799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642754210823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321377106911 + 321377106912.

It is an arithmetic number, because the mean of its divisors is an integer number (321377106912).

Almost surely, 2^642754213823 is an apocalyptic number.

642754213823 is a deficient number, since it is larger than the sum of its proper divisors (1).

642754213823 is an equidigital number, since it uses as much as digits as its factorization.

642754213823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 47.

The spelling of 642754213823 in words is "six hundred forty-two billion, seven hundred fifty-four million, two hundred thirteen thousand, eight hundred twenty-three".