55535658758221 has 4 divisors (see below), whose sum is σ = 55566122643072. Its totient is φ = 55505194873372.

The previous prime is 55535658758191. The next prime is 55535658758231. The reversal of 55535658758221 is 12285785653555.

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 55535658758221 - 2¹⁵ = 55535658725453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55535658758231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15231939691 + ... + 15231943336.

It is an arithmetic number, because the mean of its divisors is an integer number (13891530660768).

Almost surely, 2^{55535658758221} is an apocalyptic number.

It is an amenable number.

55535658758221 is a deficient number, since it is larger than the sum of its proper divisors (30463884851).

55535658758221 is a wasteful number, since it uses less digits than its factorization.

55535658758221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30463884850.

The product of its digits is 504000000, while the sum is 67.

The spelling of 55535658758221 in words is "fifty-five trillion, five hundred thirty-five billion, six hundred fifty-eight million, seven hundred fifty-eight thousand, two hundred twenty-one".