6661055505 has 32 divisors (see below), whose sum is σ = 11508908544. Its totient is φ = 3270318336.

The previous prime is 6661055497. The next prime is 6661055581. The reversal of 6661055505 is 5055501666.

6661055505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6661055505 - 2³ = 6661055497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25027 + ... + 118103.

It is an arithmetic number, because the mean of its divisors is an integer number (359653392).

Almost surely, 2^6661055505 is an apocalyptic number.

6661055505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6661055505 is a deficient number, since it is larger than the sum of its proper divisors (4847853039).

6661055505 is a wasteful number, since it uses less digits than its factorization.

6661055505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93465.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 6661055505 is about 81615.2896521234. The cubic root of 6661055505 is about 1881.5438790203.

It can be divided in two parts, 666105 and 5505, that multiplied together give a square (3666908025 = 60555²).

The spelling of 6661055505 in words is "six billion, six hundred sixty-one million, fifty-five thousand, five hundred five".