6660808155 has 12 divisors (see below), whose sum is σ = 11545400880. Its totient is φ = 3552430992.

The previous prime is 6660808111. The next prime is 6660808213. The reversal of 6660808155 is 5518080666.

It is not a de Polignac number, because 6660808155 - 2¹⁷ = 6660677083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 148017959 = 6660808155 / (6 + 6 + 6 + 0 + 8 + 0 + 8 + 1 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 6660808155.

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 11 ways as a sum of consecutive naturals, for example, 74008935 + ... + 74009024.

It is an arithmetic number, because the mean of its divisors is an integer number (962116740).

Almost surely, 2^6660808155 is an apocalyptic number.

6660808155 is a deficient number, since it is larger than the sum of its proper divisors (4884592725).

6660808155 is a wasteful number, since it uses less digits than its factorization.

6660808155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148017970 (or 148017967 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 6660808155 is about 81613.7742969898. The cubic root of 6660808155 is about 1881.5205891358.

The spelling of 6660808155 in words is "six billion, six hundred sixty million, eight hundred eight thousand, one hundred fifty-five".