6661500555 has 16 divisors (see below), whose sum is σ = 10659873024. Its totient is φ = 3552309600.

The previous prime is 6661500553. The next prime is 6661500563. The reversal of 6661500555 is 5550051666.

It is not a de Polignac number, because 6661500555 - 2¹ = 6661500553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6661500553) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 99330 + ... + 152280.

It is an arithmetic number, because the mean of its divisors is an integer number (666242064).

Almost surely, 2^6661500555 is an apocalyptic number.

6661500555 is a deficient number, since it is larger than the sum of its proper divisors (3998372469).

6661500555 is a wasteful number, since it uses less digits than its factorization.

6661500555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61346.

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

The square root of 6661500555 is about 81618.0161177665. The cubic root of 6661500555 is about 1881.5857824120.

The spelling of 6661500555 in words is "six billion, six hundred sixty-one million, five hundred thousand, five hundred fifty-five".