55520945 has 16 divisors (see below), whose sum is σ = 71461440. Its totient is φ = 41281344.

The previous prime is 55520939. The next prime is 55520977. The reversal of 55520945 is 54902555.

It is a cyclic number.

It is not a de Polignac number, because 55520945 - 2¹⁰ = 55519921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (4466340).

Almost surely, 2^55520945 is an apocalyptic number.

It is an amenable number.

55520945 is a deficient number, since it is larger than the sum of its proper divisors (15940495).

55520945 is a wasteful number, since it uses less digits than its factorization.

55520945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 55520945 is about 7451.2378166315. The cubic root of 55520945 is about 381.4921593321.

It can be divided in two parts, 55520 and 945, that added together give a palindrome (56465).

The spelling of 55520945 in words is "fifty-five million, five hundred twenty thousand, nine hundred forty-five".