57051666 has 48 divisors (see below), whose sum is σ = 142556544. Its totient is φ = 16152192.

The previous prime is 57051649. The next prime is 57051697. The reversal of 57051666 is 66615075.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 57051666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12235 + ... + 16241.

It is an arithmetic number, because the mean of its divisors is an integer number (2969928).

Almost surely, 2^57051666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57051666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71278272).

57051666 is an abundant number, since it is smaller than the sum of its proper divisors (85504878).

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

57051666 is a wasteful number, since it uses less digits than its factorization.

57051666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135 (or 4132 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 57051666 is about 7553.2553246928. The cubic root of 57051666 is about 384.9663567611.

The spelling of 57051666 in words is "fifty-seven million, fifty-one thousand, six hundred sixty-six".