155531423305 has 4 divisors (see below), whose sum is σ = 186637707972. Its totient is φ = 124425138640.

The previous prime is 155531423251. The next prime is 155531423329. The reversal of 155531423305 is 503324135551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503324135551 = 258677 ⋅1945763.

It can be written as a sum of positive squares in 2 ways, for example, as 108804980736 + 46726442569 = 329856^2 + 216163^2 .

It is not a de Polignac number, because 155531423305 - 2²⁵ = 155497868873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15553142326 + ... + 15553142335.

It is an arithmetic number, because the mean of its divisors is an integer number (46659426993).

Almost surely, 2^155531423305 is an apocalyptic number.

It is an amenable number.

155531423305 is a deficient number, since it is larger than the sum of its proper divisors (31106284667).

155531423305 is an equidigital number, since it uses as much as digits as its factorization.

155531423305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31106284666.

The product of its (nonzero) digits is 135000, while the sum is 37.

Adding to 155531423305 its reverse (503324135551), we get a palindrome (658855558856).

The spelling of 155531423305 in words is "one hundred fifty-five billion, five hundred thirty-one million, four hundred twenty-three thousand, three hundred five".