55644557 has 4 divisors (see below), whose sum is σ = 56013216. Its totient is φ = 55275900.

The previous prime is 55644551. The next prime is 55644583. The reversal of 55644557 is 75544655.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75544655 = 5 ⋅15108931.

It is a cyclic number.

It is not a de Polignac number, because 55644557 - 2²² = 51450253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55644551) by changing a digit.

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, 184103 + ... + 184404.

It is an arithmetic number, because the mean of its divisors is an integer number (14003304).

Almost surely, 2^55644557 is an apocalyptic number.

It is an amenable number.

55644557 is a deficient number, since it is larger than the sum of its proper divisors (368659).

55644557 is a wasteful number, since it uses less digits than its factorization.

55644557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368658.

The product of its digits is 420000, while the sum is 41.

The square root of 55644557 is about 7459.5279341256. The cubic root of 55644557 is about 381.7750679124.

The spelling of 55644557 in words is "fifty-five million, six hundred forty-four thousand, five hundred fifty-seven".