1684812623621 has 2 divisors, whose sum is σ = 1684812623622. Its totient is φ = 1684812623620.

The previous prime is 1684812623597. The next prime is 1684812623629. The reversal of 1684812623621 is 1263262184861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1029384751396 + 655427872225 = 1014586^2 + 809585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1684812623621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1684812623621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684812623629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842406311810 + 842406311811.

It is an arithmetic number, because the mean of its divisors is an integer number (842406311811).

Almost surely, 2^{1684812623621} is an apocalyptic number.

It is an amenable number.

1684812623621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684812623621 is an equidigital number, since it uses as much as digits as its factorization.

1684812623621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 50.

The spelling of 1684812623621 in words is "one trillion, six hundred eighty-four billion, eight hundred twelve million, six hundred twenty-three thousand, six hundred twenty-one".