642220817419 has 2 divisors, whose sum is σ = 642220817420. Its totient is φ = 642220817418.

The previous prime is 642220817411. The next prime is 642220817423. The reversal of 642220817419 is 914718022246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642220817419 - 2³ = 642220817411 is a prime.

It is a super-2 number, since 2×642220817419² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (642220817411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321110408709 + 321110408710.

It is an arithmetic number, because the mean of its divisors is an integer number (321110408710).

Almost surely, 2^642220817419 is an apocalyptic number.

642220817419 is a deficient number, since it is larger than the sum of its proper divisors (1).

642220817419 is an equidigital number, since it uses as much as digits as its factorization.

642220817419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 642220817419 in words is "six hundred forty-two billion, two hundred twenty million, eight hundred seventeen thousand, four hundred nineteen".