18669325936621 has 2 divisors, whose sum is σ = 18669325936622. Its totient is φ = 18669325936620.

The previous prime is 18669325936603. The next prime is 18669325936687. The reversal of 18669325936621 is 12663952396681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18440033402596 + 229292534025 = 4294186^2 + 478845^2 .

It is a cyclic number.

It is not a de Polignac number, because 18669325936621 - 2¹⁵ = 18669325903853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18669325936691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334662968310 + 9334662968311.

It is an arithmetic number, because the mean of its divisors is an integer number (9334662968311).

Almost surely, 2^{18669325936621} is an apocalyptic number.

It is an amenable number.

18669325936621 is a deficient number, since it is larger than the sum of its proper divisors (1).

18669325936621 is an equidigital number, since it uses as much as digits as its factorization.

18669325936621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151165440, while the sum is 67.

The spelling of 18669325936621 in words is "eighteen trillion, six hundred sixty-nine billion, three hundred twenty-five million, nine hundred thirty-six thousand, six hundred twenty-one".