181381210553 has 2 divisors, whose sum is σ = 181381210554. Its totient is φ = 181381210552.

The previous prime is 181381210537. The next prime is 181381210567. The reversal of 181381210553 is 355012183181.

181381210553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141972211264 + 39408999289 = 376792^2 + 198517^2 .

It is a cyclic number.

It is not a de Polignac number, because 181381210553 - 2⁴ = 181381210537 is a prime.

It is not a weakly prime, because it can be changed into another prime (181381212553) 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, 90690605276 + 90690605277.

It is an arithmetic number, because the mean of its divisors is an integer number (90690605277).

Almost surely, 2^181381210553 is an apocalyptic number.

It is an amenable number.

181381210553 is a deficient number, since it is larger than the sum of its proper divisors (1).

181381210553 is an equidigital number, since it uses as much as digits as its factorization.

181381210553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 181381210553 in words is "one hundred eighty-one billion, three hundred eighty-one million, two hundred ten thousand, five hundred fifty-three".