6111661555 has 16 divisors (see below), whose sum is σ = 7401715200. Its totient is φ = 4844301280.

The previous prime is 6111661487. The next prime is 6111661559. The reversal of 6111661555 is 5551661116.

It is not a de Polignac number, because 6111661555 - 2¹³ = 6111653363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6111661559) 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, 424566 + ... + 438724.

It is an arithmetic number, because the mean of its divisors is an integer number (462607200).

Almost surely, 2^6111661555 is an apocalyptic number.

6111661555 is a deficient number, since it is larger than the sum of its proper divisors (1290053645).

6111661555 is a wasteful number, since it uses less digits than its factorization.

6111661555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14954.

The product of its digits is 27000, while the sum is 37.

The square root of 6111661555 is about 78177.1165687249. The cubic root of 6111661555 is about 1828.3237414946.

The spelling of 6111661555 in words is "six billion, one hundred eleven million, six hundred sixty-one thousand, five hundred fifty-five".