55648570821 has 16 divisors (see below), whose sum is σ = 75026079744. Its totient is φ = 36686959344.

The previous prime is 55648570819. The next prime is 55648570883. The reversal of 55648570821 is 12807584655.

It is not a de Polignac number, because 55648570821 - 2¹ = 55648570819 is a prime.

It is a super-2 number, since 2×55648570821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55648570801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120915 + ... + 354848.

It is an arithmetic number, because the mean of its divisors is an integer number (4689129984).

Almost surely, 2^55648570821 is an apocalyptic number.

It is an amenable number.

55648570821 is a deficient number, since it is larger than the sum of its proper divisors (19377508923).

55648570821 is a wasteful number, since it uses less digits than its factorization.

55648570821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476200.

The product of its (nonzero) digits is 2688000, while the sum is 51.

The spelling of 55648570821 in words is "fifty-five billion, six hundred forty-eight million, five hundred seventy thousand, eight hundred twenty-one".