156440441138 has 4 divisors (see below), whose sum is σ = 234660661710. Its totient is φ = 78220220568.

The previous prime is 156440441051. The next prime is 156440441149. The reversal of 156440441138 is 831144044651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831144044651 = 10909 ⋅76188839.

It can be written as a sum of positive squares in only one way, i.e., 107326346449 + 49114094689 = 327607^2 + 221617^2 .

It is a super-2 number, since 2×156440441138² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 156440441095 and 156440441104.

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 as a sum of consecutive naturals, namely, 39110110283 + ... + 39110110286.

Almost surely, 2^156440441138 is an apocalyptic number.

156440441138 is a deficient number, since it is larger than the sum of its proper divisors (78220220572).

156440441138 is an equidigital number, since it uses as much as digits as its factorization.

156440441138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78220220571.

The product of its (nonzero) digits is 184320, while the sum is 41.

Adding to 156440441138 its reverse (831144044651), we get a palindrome (987584485789).

The spelling of 156440441138 in words is "one hundred fifty-six billion, four hundred forty million, four hundred forty-one thousand, one hundred thirty-eight".