55643405 has 4 divisors (see below), whose sum is σ = 66772092. Its totient is φ = 44514720.

The previous prime is 55643387. The next prime is 55643453. The reversal of 55643405 is 50434655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50434655 = 5 ⋅10086931.

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 35022724 = 4541^2 + 5918^2 .

It is not a de Polignac number, because 55643405 - 2²⁰ = 54594829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5564336 + ... + 5564345.

It is an arithmetic number, because the mean of its divisors is an integer number (16693023).

Almost surely, 2^55643405 is an apocalyptic number.

It is an amenable number.

55643405 is a deficient number, since it is larger than the sum of its proper divisors (11128687).

55643405 is a wasteful number, since it uses less digits than its factorization.

55643405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11128686.

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 55643405 is about 7459.4507170434. The cubic root of 55643405 is about 381.7724332857.

The spelling of 55643405 in words is "fifty-five million, six hundred forty-three thousand, four hundred five".