181998541494479 has 2 divisors, whose sum is σ = 181998541494480. Its totient is φ = 181998541494478.

The previous prime is 181998541494421. The next prime is 181998541494527. The reversal of 181998541494479 is 974494145899181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 181998541494479 - 2¹⁶ = 181998541428943 is a prime.

It is a super-2 number, since 2×181998541494479² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181998541494397 and 181998541494406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181998541484479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90999270747239 + 90999270747240.

It is an arithmetic number, because the mean of its divisors is an integer number (90999270747240).

Almost surely, 2^{181998541494479} is an apocalyptic number.

181998541494479 is a deficient number, since it is larger than the sum of its proper divisors (1).

181998541494479 is an equidigital number, since it uses as much as digits as its factorization.

181998541494479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3762339840, while the sum is 83.

The spelling of 181998541494479 in words is "one hundred eighty-one trillion, nine hundred ninety-eight billion, five hundred forty-one million, four hundred ninety-four thousand, four hundred seventy-nine".