550566161 has 4 divisors (see below), whose sum is σ = 551670000. Its totient is φ = 549462324.

The previous prime is 550566139. The next prime is 550566167. The reversal of 550566161 is 161665055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161665055 = 5 ⋅32333011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550566161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550566167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551171 + ... + 552168.

It is an arithmetic number, because the mean of its divisors is an integer number (137917500).

Almost surely, 2^550566161 is an apocalyptic number.

It is an amenable number.

550566161 is a deficient number, since it is larger than the sum of its proper divisors (1103839).

550566161 is a wasteful number, since it uses less digits than its factorization.

550566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103838.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 550566161 is about 23464.1462874744. The cubic root of 550566161 is about 819.6023061612.

The spelling of 550566161 in words is "five hundred fifty million, five hundred sixty-six thousand, one hundred sixty-one".