643450534093 has 2 divisors, whose sum is σ = 643450534094. Its totient is φ = 643450534092.

The previous prime is 643450534037. The next prime is 643450534127. The reversal of 643450534093 is 390435054346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607592188324 + 35858345769 = 779482^2 + 189363^2 .

It is a cyclic number.

It is not a de Polignac number, because 643450534093 - 2²¹ = 643448436941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643450534033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321725267046 + 321725267047.

It is an arithmetic number, because the mean of its divisors is an integer number (321725267047).

Almost surely, 2^643450534093 is an apocalyptic number.

It is an amenable number.

643450534093 is a deficient number, since it is larger than the sum of its proper divisors (1).

643450534093 is an equidigital number, since it uses as much as digits as its factorization.

643450534093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 46.

The spelling of 643450534093 in words is "six hundred forty-three billion, four hundred fifty million, five hundred thirty-four thousand, ninety-three".