55220507 has 4 divisors (see below), whose sum is σ = 55358616. Its totient is φ = 55082400.

The previous prime is 55220491. The next prime is 55220509. The reversal of 55220507 is 70502255.

55220507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55220507 - 2⁴ = 55220491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55220509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68453 + ... + 69254.

It is an arithmetic number, because the mean of its divisors is an integer number (13839654).

Almost surely, 2^55220507 is an apocalyptic number.

55220507 is a deficient number, since it is larger than the sum of its proper divisors (138109).

55220507 is a wasteful number, since it uses less digits than its factorization.

55220507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138108.

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 55220507 is about 7431.0501949590. The cubic root of 55220507 is about 380.8027972565.

The spelling of 55220507 in words is "fifty-five million, two hundred twenty thousand, five hundred seven".