55521663 has 8 divisors (see below), whose sum is σ = 74110848. Its totient is φ = 36973464.

The previous prime is 55521659. The next prime is 55521673. The reversal of 55521663 is 36612555.

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

It is not a de Polignac number, because 55521663 - 2² = 55521659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55521673) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 6931 + ... + 12612.

It is an arithmetic number, because the mean of its divisors is an integer number (9263856).

Almost surely, 2^55521663 is an apocalyptic number.

55521663 is a deficient number, since it is larger than the sum of its proper divisors (18589185).

55521663 is a wasteful number, since it uses less digits than its factorization.

55521663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20493.

The product of its digits is 27000, while the sum is 33.

The square root of 55521663 is about 7451.2859963902. The cubic root of 55521663 is about 381.4938038177.

The spelling of 55521663 in words is "fifty-five million, five hundred twenty-one thousand, six hundred sixty-three".