18842124409 has 2 divisors, whose sum is σ = 18842124410. Its totient is φ = 18842124408.

The previous prime is 18842124359. The next prime is 18842124473. The reversal of 18842124409 is 90442124881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13801550400 + 5040574009 = 117480^2 + 70997^2 .

It is a cyclic number.

It is not a de Polignac number, because 18842124409 - 2¹⁵ = 18842091641 is a prime.

It is not a weakly prime, because it can be changed into another prime (18842104409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421062204 + 9421062205.

It is an arithmetic number, because the mean of its divisors is an integer number (9421062205).

Almost surely, 2^18842124409 is an apocalyptic number.

It is an amenable number.

18842124409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18842124409 is an equidigital number, since it uses as much as digits as its factorization.

18842124409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 43.

The spelling of 18842124409 in words is "eighteen billion, eight hundred forty-two million, one hundred twenty-four thousand, four hundred nine".