555665161 has 4 divisors (see below), whose sum is σ = 567487872. Its totient is φ = 543842452.

The previous prime is 555665153. The next prime is 555665167. The reversal of 555665161 is 161566555.

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.

It is not a de Polignac number, because 555665161 - 2³ = 555665153 is a prime.

It is a super-2 number, since 2×555665161² = 617527542298311842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555665167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5911285 + ... + 5911378.

It is an arithmetic number, because the mean of its divisors is an integer number (141871968).

Almost surely, 2^555665161 is an apocalyptic number.

It is an amenable number.

555665161 is a deficient number, since it is larger than the sum of its proper divisors (11822711).

555665161 is a wasteful number, since it uses less digits than its factorization.

555665161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11822710.

The product of its digits is 135000, while the sum is 40.

The square root of 555665161 is about 23572.5510074748. The cubic root of 555665161 is about 822.1247499427.

The spelling of 555665161 in words is "five hundred fifty-five million, six hundred sixty-five thousand, one hundred sixty-one".