2054661666 has 16 divisors (see below), whose sum is σ = 4178973600. Its totient is φ = 673278848.

The previous prime is 2054661601. The next prime is 2054661683. The reversal of 2054661666 is 6661664502.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2901711 + ... + 2902418.

It is an arithmetic number, because the mean of its divisors is an integer number (261185850).

Almost surely, 2^2054661666 is an apocalyptic number.

2054661666 is an abundant number, since it is smaller than the sum of its proper divisors (2124311934).

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

2054661666 is a wasteful number, since it uses less digits than its factorization.

2054661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5804193.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 2054661666 is about 45328.3759470820. The cubic root of 2054661666 is about 1271.2962700349.

The spelling of 2054661666 in words is "two billion, fifty-four million, six hundred sixty-one thousand, six hundred sixty-six".