643245704819 has 2 divisors, whose sum is σ = 643245704820. Its totient is φ = 643245704818.

The previous prime is 643245704683. The next prime is 643245704831. The reversal of 643245704819 is 918407542346.

643245704819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643245704819 - 2¹² = 643245700723 is a prime.

It is a super-2 number, since 2×643245704819² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643245704839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321622852409 + 321622852410.

It is an arithmetic number, because the mean of its divisors is an integer number (321622852410).

It is a 1-persistent number, because it is pandigital, but 2⋅643245704819 = 1286491409638 is not.

Almost surely, 2^643245704819 is an apocalyptic number.

643245704819 is a deficient number, since it is larger than the sum of its proper divisors (1).

643245704819 is an equidigital number, since it uses as much as digits as its factorization.

643245704819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 643245704819 in words is "six hundred forty-three billion, two hundred forty-five million, seven hundred four thousand, eight hundred nineteen".