550390018 has 4 divisors (see below), whose sum is σ = 825585030. Its totient is φ = 275195008.

The previous prime is 550390013. The next prime is 550390031. The reversal of 550390018 is 810093055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810093055 = 5 ⋅162018611.

It can be written as a sum of positive squares in only one way, i.e., 357096609 + 193293409 = 18897^2 + 13903^2 .

It is not an unprimeable number, because it can be changed into a prime (550390013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137597503 + ... + 137597506.

Almost surely, 2^550390018 is an apocalyptic number.

550390018 is a deficient number, since it is larger than the sum of its proper divisors (275195012).

550390018 is a wasteful number, since it uses less digits than its factorization.

550390018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275195011.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 550390018 is about 23460.3925372105. The cubic root of 550390018 is about 819.5148915337.

The spelling of 550390018 in words is "five hundred fifty million, three hundred ninety thousand, eighteen".