643266662141 has 2 divisors, whose sum is σ = 643266662142. Its totient is φ = 643266662140.

The previous prime is 643266662117. The next prime is 643266662179. The reversal of 643266662141 is 141266662346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417860109241 + 225406552900 = 646421^2 + 474770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643266662141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643266262141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321633331070 + 321633331071.

It is an arithmetic number, because the mean of its divisors is an integer number (321633331071).

Almost surely, 2^643266662141 is an apocalyptic number.

It is an amenable number.

643266662141 is a deficient number, since it is larger than the sum of its proper divisors (1).

643266662141 is an equidigital number, since it uses as much as digits as its factorization.

643266662141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 47.

The spelling of 643266662141 in words is "six hundred forty-three billion, two hundred sixty-six million, six hundred sixty-two thousand, one hundred forty-one".