55621617065205 has 16 divisors (see below), whose sum is σ = 94229563028544. Its totient is φ = 27919870526720.

The previous prime is 55621617065173. The next prime is 55621617065219. The reversal of 55621617065205 is 50256071612655.

It is not a de Polignac number, because 55621617065205 - 2⁵ = 55621617065173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109061993991 + ... + 109061994500.

It is an arithmetic number, because the mean of its divisors is an integer number (5889347689284).

Almost surely, 2^{55621617065205} is an apocalyptic number.

It is an amenable number.

55621617065205 is a deficient number, since it is larger than the sum of its proper divisors (38607945963339).

55621617065205 is a wasteful number, since it uses less digits than its factorization.

55621617065205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218123988516.

The product of its (nonzero) digits is 3780000, while the sum is 51.

The spelling of 55621617065205 in words is "fifty-five trillion, six hundred twenty-one billion, six hundred seventeen million, sixty-five thousand, two hundred five".