105531538018 has 4 divisors (see below), whose sum is σ = 158297307030. Its totient is φ = 52765769008.

The previous prime is 105531538003. The next prime is 105531538019. The reversal of 105531538018 is 810835135501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810835135501 = 166657 ⋅4865293.

It can be written as a sum of positive squares in only one way, i.e., 88052847169 + 17478690849 = 296737^2 + 132207^2 .

It is a super-2 number, since 2×105531538018² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105531538019) 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 as a sum of consecutive naturals, namely, 26382884503 + ... + 26382884506.

Almost surely, 2^105531538018 is an apocalyptic number.

105531538018 is a deficient number, since it is larger than the sum of its proper divisors (52765769012).

105531538018 is an equidigital number, since it uses as much as digits as its factorization.

105531538018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52765769011.

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 105531538018 in words is "one hundred five billion, five hundred thirty-one million, five hundred thirty-eight thousand, eighteen".