213443123661689 has 2 divisors, whose sum is σ = 213443123661690. Its totient is φ = 213443123661688.

The previous prime is 213443123661619. The next prime is 213443123661727. The reversal of 213443123661689 is 986166321344312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188728385244025 + 24714738417664 = 13737845^2 + 4971392^2 .

It is a cyclic number.

It is not a de Polignac number, because 213443123661689 - 2²⁴ = 213443106884473 is a prime.

It is a super-3 number, since 3×213443123661689³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (213443123661619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106721561830844 + 106721561830845.

It is an arithmetic number, because the mean of its divisors is an integer number (106721561830845).

Almost surely, 2^{213443123661689} is an apocalyptic number.

It is an amenable number.

213443123661689 is a deficient number, since it is larger than the sum of its proper divisors (1).

213443123661689 is an equidigital number, since it uses as much as digits as its factorization.

213443123661689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 59.

The spelling of 213443123661689 in words is "two hundred thirteen trillion, four hundred forty-three billion, one hundred twenty-three million, six hundred sixty-one thousand, six hundred eighty-nine".