181623425929 has 81 divisors (see below), whose sum is σ = 221290096629. Its totient is φ = 148921893120.

The previous prime is 181623425927. The next prime is 181623425933. The reversal of 181623425929 is 929524326181.

It is a happy number.

The square root of 181623425929 is 426173.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 45506702329 + 136116723600 = 213323^2 + 368940^2 .

It is not a de Polignac number, because 181623425929 - 2¹ = 181623425927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181623425927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 3426857067 + ... + 3426857119.

Almost surely, 2^181623425929 is an apocalyptic number.

181623425929 is the 426173-rd square number.

181623425929 is the 213087-th centered octagonal number.

It is an amenable number.

181623425929 is a deficient number, since it is larger than the sum of its proper divisors (39666670700).

181623425929 is an equidigital number, since it uses as much as digits as its factorization.

181623425929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 124 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The spelling of 181623425929 in words is "one hundred eighty-one billion, six hundred twenty-three million, four hundred twenty-five thousand, nine hundred twenty-nine".