643434202434377 has 2 divisors, whose sum is σ = 643434202434378. Its totient is φ = 643434202434376.

The previous prime is 643434202434313. The next prime is 643434202434391. The reversal of 643434202434377 is 773434202434346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526866421652041 + 116567780782336 = 22953571^2 + 10796656^2 .

It is a cyclic number.

It is not a de Polignac number, because 643434202434377 - 2⁶ = 643434202434313 is a prime.

It is not a weakly prime, because it can be changed into another prime (643434202464377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321717101217188 + 321717101217189.

It is an arithmetic number, because the mean of its divisors is an integer number (321717101217189).

Almost surely, 2^{643434202434377} is an apocalyptic number.

It is an amenable number.

643434202434377 is a deficient number, since it is larger than the sum of its proper divisors (1).

643434202434377 is an equidigital number, since it uses as much as digits as its factorization.

643434202434377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97542144, while the sum is 56.

The spelling of 643434202434377 in words is "six hundred forty-three trillion, four hundred thirty-four billion, two hundred two million, four hundred thirty-four thousand, three hundred seventy-seven".