6111111555666 has 48 divisors (see below), whose sum is σ = 14260042941144. Its totient is φ = 1880238811392.

The previous prime is 6111111555649. The next prime is 6111111555673. The reversal of 6111111555666 is 6665551111116.

It can be written as a sum of positive squares in 4 ways, for example, as 4804710561225 + 1306400994441 = 2191965^2 + 1142979^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3611460 + ... + 5026416.

Almost surely, 2^{6111111555666} is an apocalyptic number.

6111111555666 is an abundant number, since it is smaller than the sum of its proper divisors (8148931385478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6111111555666 is a wasteful number, since it uses less digits than its factorization.

6111111555666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433435 (or 1433432 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The spelling of 6111111555666 in words is "six trillion, one hundred eleven billion, one hundred eleven million, five hundred fifty-five thousand, six hundred sixty-six".