2155344655 has 4 divisors (see below), whose sum is σ = 2586413592. Its totient is φ = 1724275720.

The previous prime is 2155344613. The next prime is 2155344671. The reversal of 2155344655 is 5564435512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2155344655 - 2²³ = 2146956047 is a prime.

It is a Smith number, since the sum of its digits (40) 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 a congruent 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, 215534461 + ... + 215534470.

It is an arithmetic number, because the mean of its divisors is an integer number (646603398).

Almost surely, 2^2155344655 is an apocalyptic number.

2155344655 is a deficient number, since it is larger than the sum of its proper divisors (431068937).

2155344655 is an equidigital number, since it uses as much as digits as its factorization.

2155344655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431068936.

The product of its digits is 360000, while the sum is 40.

The square root of 2155344655 is about 46425.6896017711. The cubic root of 2155344655 is about 1291.7314759758.

The spelling of 2155344655 in words is "two billion, one hundred fifty-five million, three hundred forty-four thousand, six hundred fifty-five".