55121221608 has 32 divisors (see below), whose sum is σ = 137821932960. Its totient is φ = 18371223360.

The previous prime is 55121221567. The next prime is 55121221621. The reversal of 55121221608 is 80612212155.

It is a super-2 number, since 2×55121221608² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25863 + ... + 333033.

It is an arithmetic number, because the mean of its divisors is an integer number (4306935405).

Almost surely, 2^55121221608 is an apocalyptic number.

It is an amenable number.

55121221608 is an abundant number, since it is smaller than the sum of its proper divisors (82700711352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55121221608 is a wasteful number, since it uses less digits than its factorization.

55121221608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314657 (or 314653 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 55121221608 in words is "fifty-five billion, one hundred twenty-one million, two hundred twenty-one thousand, six hundred eight".