164556155 has 4 divisors (see below), whose sum is σ = 197467392. Its totient is φ = 131644920.

The previous prime is 164556143. The next prime is 164556163. The reversal of 164556155 is 551655461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551655461 = 7 ⋅78807923.

It is not a de Polignac number, because 164556155 - 2⁸ = 164555899 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16455611 + ... + 16455620.

It is an arithmetic number, because the mean of its divisors is an integer number (49366848).

Almost surely, 2^164556155 is an apocalyptic number.

164556155 is a deficient number, since it is larger than the sum of its proper divisors (32911237).

164556155 is an equidigital number, since it uses as much as digits as its factorization.

164556155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32911236.

The product of its digits is 90000, while the sum is 38.

The square root of 164556155 is about 12827.9443014070. The cubic root of 164556155 is about 547.9884148278.

The spelling of 164556155 in words is "one hundred sixty-four million, five hundred fifty-six thousand, one hundred fifty-five".