55505610121 has 8 divisors (see below), whose sum is σ = 60120796680. Its totient is φ = 50939784192.

The previous prime is 55505610091. The next prime is 55505610161. The reversal of 55505610121 is 12101650555.

It can be written as a sum of positive squares in 4 ways, for example, as 20790467721 + 34715142400 = 144189^2 + 186320^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55505610121 - 2¹⁷ = 55505479049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55505610161) 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, 12337816 + ... + 12342313.

It is an arithmetic number, because the mean of its divisors is an integer number (7515099585).

Almost surely, 2^55505610121 is an apocalyptic number.

It is an amenable number.

55505610121 is a deficient number, since it is larger than the sum of its proper divisors (4615186559).

55505610121 is a wasteful number, since it uses less digits than its factorization.

55505610121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24680315.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 55505610121 in words is "fifty-five billion, five hundred five million, six hundred ten thousand, one hundred twenty-one".