550161661 has 12 divisors (see below), whose sum is σ = 640367868. Its totient is φ = 471284352.

The previous prime is 550161613. The next prime is 550161719. The reversal of 550161661 is 166161055.

It can be written as a sum of positive squares in 2 ways, for example, as 248062500 + 302099161 = 15750^2 + 17381^2 .

It is not a de Polignac number, because 550161661 - 2⁹ = 550161149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550161761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146965 + ... + 150661.

It is an arithmetic number, because the mean of its divisors is an integer number (53363989).

Almost surely, 2^550161661 is an apocalyptic number.

It is an amenable number.

550161661 is a deficient number, since it is larger than the sum of its proper divisors (90206207).

550161661 is a wasteful number, since it uses less digits than its factorization.

550161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6748 (or 6741 counting only the distinct ones).

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

The square root of 550161661 is about 23455.5251699893. The cubic root of 550161661 is about 819.4015368557.

The spelling of 550161661 in words is "five hundred fifty million, one hundred sixty-one thousand, six hundred sixty-one".