55555646 has 4 divisors (see below), whose sum is σ = 83333472. Its totient is φ = 27777822.

The previous prime is 55555631. The next prime is 55555651. The reversal of 55555646 is 64655555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64655555 = 5 ⋅12931111.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888910 + ... + 13888913.

It is an arithmetic number, because the mean of its divisors is an integer number (20833368).

Almost surely, 2^55555646 is an apocalyptic number.

55555646 is a deficient number, since it is larger than the sum of its proper divisors (27777826).

55555646 is a wasteful number, since it uses less digits than its factorization.

55555646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27777825.

The product of its digits is 450000, while the sum is 41.

The square root of 55555646 is about 7453.5659921946. The cubic root of 55555646 is about 381.5716212504.

Subtracting 55555646 from its reverse (64655555), we obtain a palindrome (9099909).

The spelling of 55555646 in words is "fifty-five million, five hundred fifty-five thousand, six hundred forty-six".