181436740426 has 4 divisors (see below), whose sum is σ = 272155110642. Its totient is φ = 90718370212.

The previous prime is 181436740421. The next prime is 181436740427. The reversal of 181436740426 is 624047634181.

181436740426 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 624047634181 = 937 ⋅666006013.

It can be written as a sum of positive squares in only one way, i.e., 145507917025 + 35928823401 = 381455^2 + 189549^2 .

It is a super-2 number, since 2×181436740426² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181436740421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45359185105 + ... + 45359185108.

Almost surely, 2^181436740426 is an apocalyptic number.

181436740426 is a deficient number, since it is larger than the sum of its proper divisors (90718370216).

181436740426 is an equidigital number, since it uses as much as digits as its factorization.

181436740426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90718370215.

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 181436740426 in words is "one hundred eighty-one billion, four hundred thirty-six million, seven hundred forty thousand, four hundred twenty-six".