181243478530 has 16 divisors (see below), whose sum is σ = 345428747640. Its totient is φ = 68232838912.

The previous prime is 181243478501. The next prime is 181243478573. The reversal of 181243478530 is 35874342181.

It is a Cunningham number, because it is equal to 425727²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 141106160881 + 40137317649 = 375641^2 + 200343^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533068885 + ... + 533069224.

Almost surely, 2^181243478530 is an apocalyptic number.

181243478530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181243478530 is a deficient number, since it is larger than the sum of its proper divisors (164185269110).

181243478530 is a wasteful number, since it uses less digits than its factorization.

181243478530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066138133.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 181243478530 in words is "one hundred eighty-one billion, two hundred forty-three million, four hundred seventy-eight thousand, five hundred thirty".