55121556563557 has 4 divisors (see below), whose sum is σ = 60132607160256. Its totient is φ = 50110505966860.

The previous prime is 55121556563543. The next prime is 55121556563599. The reversal of 55121556563557 is 75536565512155.

55121556563557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55121556563557 - 2¹⁹ = 55121556039269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55121556563495 and 55121556563504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121556567557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2505525298333 + ... + 2505525298354.

It is an arithmetic number, because the mean of its divisors is an integer number (15033151790064).

Almost surely, 2^{55121556563557} is an apocalyptic number.

It is an amenable number.

55121556563557 is a deficient number, since it is larger than the sum of its proper divisors (5011050596699).

55121556563557 is a wasteful number, since it uses less digits than its factorization.

55121556563557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011050596698.

The product of its digits is 118125000, while the sum is 61.

The spelling of 55121556563557 in words is "fifty-five trillion, one hundred twenty-one billion, five hundred fifty-six million, five hundred sixty-three thousand, five hundred fifty-seven".