556168649 has 4 divisors (see below), whose sum is σ = 569733780. Its totient is φ = 542603520.

The previous prime is 556168603. The next prime is 556168673. The reversal of 556168649 is 946861655.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135303424 + 420865225 = 11632^2 + 20515^2 .

It is a cyclic number.

It is not a de Polignac number, because 556168649 - 2²⁰ = 555120073 is a prime.

It is a super-2 number, since 2×556168649² = 618647132260970402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 556168597 and 556168606.

It is not an unprimeable number, because it can be changed into a prime (556167649) 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, 6782504 + ... + 6782585.

It is an arithmetic number, because the mean of its divisors is an integer number (142433445).

Almost surely, 2^556168649 is an apocalyptic number.

It is an amenable number.

556168649 is a deficient number, since it is larger than the sum of its proper divisors (13565131).

556168649 is a wasteful number, since it uses less digits than its factorization.

556168649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13565130.

The product of its digits is 1555200, while the sum is 50.

The square root of 556168649 is about 23583.2281293295. The cubic root of 556168649 is about 822.3729839617.

The spelling of 556168649 in words is "five hundred fifty-six million, one hundred sixty-eight thousand, six hundred forty-nine".