643071144487 has 2 divisors, whose sum is σ = 643071144488. Its totient is φ = 643071144486.

The previous prime is 643071144481. The next prime is 643071144503. The reversal of 643071144487 is 784441170346.

643071144487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643071144487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643071144487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643071144481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321535572243 + 321535572244.

It is an arithmetic number, because the mean of its divisors is an integer number (321535572244).

Almost surely, 2^643071144487 is an apocalyptic number.

643071144487 is a deficient number, since it is larger than the sum of its proper divisors (1).

643071144487 is an equidigital number, since it uses as much as digits as its factorization.

643071144487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 49.

The spelling of 643071144487 in words is "six hundred forty-three billion, seventy-one million, one hundred forty-four thousand, four hundred eighty-seven".