18998281695641 has 2 divisors, whose sum is σ = 18998281695642. Its totient is φ = 18998281695640.

The previous prime is 18998281695577. The next prime is 18998281695737. The reversal of 18998281695641 is 14659618289981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12533695767616 + 6464585928025 = 3540296^2 + 2542555^2 .

It is a cyclic number.

It is not a de Polignac number, because 18998281695641 - 2⁶ = 18998281695577 is a prime.

It is not a weakly prime, because it can be changed into another prime (18998281692641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9499140847820 + 9499140847821.

It is an arithmetic number, because the mean of its divisors is an integer number (9499140847821).

Almost surely, 2^{18998281695641} is an apocalyptic number.

It is an amenable number.

18998281695641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18998281695641 is an equidigital number, since it uses as much as digits as its factorization.

18998281695641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537477120, while the sum is 77.

The spelling of 18998281695641 in words is "eighteen trillion, nine hundred ninety-eight billion, two hundred eighty-one million, six hundred ninety-five thousand, six hundred forty-one".