642842668519 has 2 divisors, whose sum is σ = 642842668520. Its totient is φ = 642842668518.

The previous prime is 642842668499. The next prime is 642842668537. The reversal of 642842668519 is 915866248246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642842668519 - 2⁵ = 642842668487 is a prime.

It is a super-2 number, since 2×642842668519² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642842668219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321421334259 + 321421334260.

It is an arithmetic number, because the mean of its divisors is an integer number (321421334260).

Almost surely, 2^642842668519 is an apocalyptic number.

642842668519 is a deficient number, since it is larger than the sum of its proper divisors (1).

642842668519 is an equidigital number, since it uses as much as digits as its factorization.

642842668519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39813120, while the sum is 61.

The spelling of 642842668519 in words is "six hundred forty-two billion, eight hundred forty-two million, six hundred sixty-eight thousand, five hundred nineteen".