156440155 has 4 divisors (see below), whose sum is σ = 187728192. Its totient is φ = 125152120.

The previous prime is 156440147. The next prime is 156440177. The reversal of 156440155 is 551044651.

156440155 is digitally balanced in base 2, 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: 551044651 = 1283 ⋅429497.

It is not a de Polignac number, because 156440155 - 2³ = 156440147 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15644011 + ... + 15644020.

It is an arithmetic number, because the mean of its divisors is an integer number (46932048).

Almost surely, 2^156440155 is an apocalyptic number.

156440155 is a deficient number, since it is larger than the sum of its proper divisors (31288037).

156440155 is an equidigital number, since it uses as much as digits as its factorization.

156440155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31288036.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 156440155 is about 12507.6038872360. The cubic root of 156440155 is about 538.8270780812.

The spelling of 156440155 in words is "one hundred fifty-six million, four hundred forty thousand, one hundred fifty-five".