55306553 has 4 divisors (see below), whose sum is σ = 55401360. Its totient is φ = 55211748.

The previous prime is 55306523. The next prime is 55306561. The reversal of 55306553 is 35560355.

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.

It is a cyclic number.

It is not a de Polignac number, because 55306553 - 2⁸ = 55306297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55306523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46523 + ... + 47696.

It is an arithmetic number, because the mean of its divisors is an integer number (13850340).

Almost surely, 2^55306553 is an apocalyptic number.

It is an amenable number.

55306553 is a deficient number, since it is larger than the sum of its proper divisors (94807).

55306553 is an equidigital number, since it uses as much as digits as its factorization.

55306553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94806.

The product of its (nonzero) digits is 33750, while the sum is 32.

The square root of 55306553 is about 7436.8375671383. The cubic root of 55306553 is about 381.0004868152. Note that the first 3 decimals are identical.

The spelling of 55306553 in words is "fifty-five million, three hundred six thousand, five hundred fifty-three".