55445555 has 8 divisors (see below), whose sum is σ = 72583344. Its totient is φ = 40324000.

The previous prime is 55445543. The next prime is 55445563. The reversal of 55445555 is 55554455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55445555 - 2¹² = 55441459 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

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 7 ways as a sum of consecutive naturals, for example, 503996 + ... + 504105.

It is an arithmetic number, because the mean of its divisors is an integer number (9072918).

Almost surely, 2^55445555 is an apocalyptic number.

55445555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55445555 is a deficient number, since it is larger than the sum of its proper divisors (17137789).

55445555 is a wasteful number, since it uses less digits than its factorization.

55445555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008117.

The product of its digits is 250000, while the sum is 38.

The square root of 55445555 is about 7446.1772071312. The cubic root of 55445555 is about 381.3194093819.

Subtracting 55445555 from its reverse (55554455), we obtain a square (108900 = 330²).

The spelling of 55445555 in words is "fifty-five million, four hundred forty-five thousand, five hundred fifty-five".