1687210544641 has 2 divisors, whose sum is σ = 1687210544642. Its totient is φ = 1687210544640.

The previous prime is 1687210544633. The next prime is 1687210544681. The reversal of 1687210544641 is 1464450127861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1543793825025 + 143416719616 = 1242495^2 + 378704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687210544641 - 2³ = 1687210544633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1687210544681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843605272320 + 843605272321.

It is an arithmetic number, because the mean of its divisors is an integer number (843605272321).

Almost surely, 2^{1687210544641} is an apocalyptic number.

It is an amenable number.

1687210544641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687210544641 is an equidigital number, since it uses as much as digits as its factorization.

1687210544641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 1687210544641 in words is "one trillion, six hundred eighty-seven billion, two hundred ten million, five hundred forty-four thousand, six hundred forty-one".