55566369 has 12 divisors (see below), whose sum is σ = 80486016. Its totient is φ = 36941112.

The previous prime is 55566311. The next prime is 55566373. The reversal of 55566369 is 96366555.

55566369 is a `hidden beast` number, since 5 + 5 + 5 + 6 + 636 + 9 = 666.

It is not a de Polignac number, because 55566369 - 2⁸ = 55566113 is a prime.

It is a super-2 number, since 2×55566369² = 6175242727688322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55566569) 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, 5109 + ... + 11714.

It is an arithmetic number, because the mean of its divisors is an integer number (6707168).

Almost surely, 2^55566369 is an apocalyptic number.

It is an amenable number.

55566369 is a deficient number, since it is larger than the sum of its proper divisors (24919647).

55566369 is a wasteful number, since it uses less digits than its factorization.

55566369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17196 (or 17193 counting only the distinct ones).

The product of its digits is 729000, while the sum is 45.

The square root of 55566369 is about 7454.2852776105. The cubic root of 55566369 is about 381.5961691861.

The spelling of 55566369 in words is "fifty-five million, five hundred sixty-six thousand, three hundred sixty-nine".