642842668499 has 2 divisors, whose sum is σ = 642842668500. Its totient is φ = 642842668498.

The previous prime is 642842668487. The next prime is 642842668519. The reversal of 642842668499 is 994866248246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642842668499 - 2²⁴ = 642825891283 is a prime.

It is not a weakly prime, because it can be changed into another prime (642842668409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321421334249 + 321421334250.

It is an arithmetic number, because the mean of its divisors is an integer number (321421334250).

Almost surely, 2^642842668499 is an apocalyptic number.

642842668499 is a deficient number, since it is larger than the sum of its proper divisors (1).

642842668499 is an equidigital number, since it uses as much as digits as its factorization.

642842668499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 286654464, while the sum is 68.

The spelling of 642842668499 in words is "six hundred forty-two billion, eight hundred forty-two million, six hundred sixty-eight thousand, four hundred ninety-nine".