81468189053 has 2 divisors, whose sum is σ = 81468189054. Its totient is φ = 81468189052.

The previous prime is 81468189043. The next prime is 81468189059. The reversal of 81468189053 is 35098186418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73361347609 + 8106841444 = 270853^2 + 90038^2 .

It is a cyclic number.

It is not a de Polignac number, because 81468189053 - 2¹⁰ = 81468188029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81468188986 and 81468189004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81468189059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40734094526 + 40734094527.

It is an arithmetic number, because the mean of its divisors is an integer number (40734094527).

Almost surely, 2^81468189053 is an apocalyptic number.

It is an amenable number.

81468189053 is a deficient number, since it is larger than the sum of its proper divisors (1).

81468189053 is an equidigital number, since it uses as much as digits as its factorization.

81468189053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 81468189053 in words is "eighty-one billion, four hundred sixty-eight million, one hundred eighty-nine thousand, fifty-three".