6644055155 has 4 divisors (see below), whose sum is σ = 7972866192. Its totient is φ = 5315244120.

The previous prime is 6644055113. The next prime is 6644055167. The reversal of 6644055155 is 5515504466.

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

It is not a de Polignac number, because 6644055155 - 2¹² = 6644051059 is a prime.

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, 664405511 + ... + 664405520.

It is an arithmetic number, because the mean of its divisors is an integer number (1993216548).

Almost surely, 2^6644055155 is an apocalyptic number.

6644055155 is a deficient number, since it is larger than the sum of its proper divisors (1328811037).

6644055155 is a wasteful number, since it uses less digits than its factorization.

6644055155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328811036.

The product of its (nonzero) digits is 360000, while the sum is 41.

The square root of 6644055155 is about 81511.0738182242. The cubic root of 6644055155 is about 1879.9418228376.

The spelling of 6644055155 in words is "six billion, six hundred forty-four million, fifty-five thousand, one hundred fifty-five".