2011851666 has 24 divisors (see below), whose sum is σ = 4755286224. Its totient is φ = 609651960.

The previous prime is 2011851659. The next prime is 2011851701. The reversal of 2011851666 is 6661581102.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2011851666.

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, 5080236 + ... + 5080631.

It is an arithmetic number, because the mean of its divisors is an integer number (198136926).

Almost surely, 2^2011851666 is an apocalyptic number.

2011851666 is an abundant number, since it is smaller than the sum of its proper divisors (2743434558).

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

2011851666 is a wasteful number, since it uses less digits than its factorization.

2011851666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160886 (or 10160883 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2011851666 is about 44853.6694819944. The cubic root of 2011851666 is about 1262.4048440650.

The spelling of 2011851666 in words is "two billion, eleven million, eight hundred fifty-one thousand, six hundred sixty-six".