550139866 has 4 divisors (see below), whose sum is σ = 825209802. Its totient is φ = 275069932.

The previous prime is 550139861. The next prime is 550139867. The reversal of 550139866 is 668931055.

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., 534765625 + 15374241 = 23125^2 + 3921^2 .

It is not an unprimeable number, because it can be changed into a prime (550139861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137534965 + ... + 137534968.

Almost surely, 2^550139866 is an apocalyptic number.

550139866 is a deficient number, since it is larger than the sum of its proper divisors (275069936).

550139866 is a wasteful number, since it uses less digits than its factorization.

550139866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275069935.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 550139866 is about 23455.0605627016. The cubic root of 550139866 is about 819.3907163438.

The spelling of 550139866 in words is "five hundred fifty million, one hundred thirty-nine thousand, eight hundred sixty-six".