57551866 has 4 divisors (see below), whose sum is σ = 86327802. Its totient is φ = 28775932.

The previous prime is 57551831. The next prime is 57551869. The reversal of 57551866 is 66815575.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55071241 + 2480625 = 7421^2 + 1575^2 .

It is not an unprimeable number, because it can be changed into a prime (57551869) 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 as a sum of consecutive naturals, namely, 14387965 + ... + 14387968.

Almost surely, 2^57551866 is an apocalyptic number.

57551866 is a deficient number, since it is larger than the sum of its proper divisors (28775936).

57551866 is a wasteful number, since it uses less digits than its factorization.

57551866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28775935.

The product of its digits is 252000, while the sum is 43.

The square root of 57551866 is about 7586.2946159505. The cubic root of 57551866 is about 386.0881477839.

It can be divided in two parts, 575 and 51866, that added together give a square (52441 = 229²).

The spelling of 57551866 in words is "fifty-seven million, five hundred fifty-one thousand, eight hundred sixty-six".