19802020181653 has 2 divisors, whose sum is σ = 19802020181654. Its totient is φ = 19802020181652.

The previous prime is 19802020181641. The next prime is 19802020181681. The reversal of 19802020181653 is 35618102020891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19780772163364 + 21248018289 = 4447558^2 + 145767^2 .

It is a cyclic number.

It is not a de Polignac number, because 19802020181653 - 2¹³ = 19802020173461 is a prime.

It is a super-2 number, since 2×19802020181653² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19802020181693) 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, 9901010090826 + 9901010090827.

It is an arithmetic number, because the mean of its divisors is an integer number (9901010090827).

Almost surely, 2^{19802020181653} is an apocalyptic number.

It is an amenable number.

19802020181653 is a deficient number, since it is larger than the sum of its proper divisors (1).

19802020181653 is an equidigital number, since it uses as much as digits as its factorization.

19802020181653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 19802020181653 in words is "nineteen trillion, eight hundred two billion, twenty million, one hundred eighty-one thousand, six hundred fifty-three".