643154442089 has 2 divisors, whose sum is σ = 643154442090. Its totient is φ = 643154442088.

The previous prime is 643154442041. The next prime is 643154442101. The reversal of 643154442089 is 980244451346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602991075625 + 40163366464 = 776525^2 + 200408^2 .

It is a cyclic number.

It is not a de Polignac number, because 643154442089 - 2¹² = 643154437993 is a prime.

It is not a weakly prime, because it can be changed into another prime (643150442089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321577221044 + 321577221045.

It is an arithmetic number, because the mean of its divisors is an integer number (321577221045).

Almost surely, 2^643154442089 is an apocalyptic number.

It is an amenable number.

643154442089 is a deficient number, since it is larger than the sum of its proper divisors (1).

643154442089 is an equidigital number, since it uses as much as digits as its factorization.

643154442089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 50.

The spelling of 643154442089 in words is "six hundred forty-three billion, one hundred fifty-four million, four hundred forty-two thousand, eighty-nine".