55855171519217 has 4 divisors (see below), whose sum is σ = 63834481736256. Its totient is φ = 47875861302180.

The previous prime is 55855171519207. The next prime is 55855171519223. The reversal of 55855171519217 is 71291517155855.

It is a happy number.

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 55855171519217 - 2⁶ = 55855171519153 is a prime.

It is a super-3 number, since 3×55855171519217³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 55855171519217.

It is not an unprimeable number, because it can be changed into a prime (55855171519207) 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, 3989655108509 + ... + 3989655108522.

It is an arithmetic number, because the mean of its divisors is an integer number (15958620434064).

Almost surely, 2^{55855171519217} is an apocalyptic number.

It is an amenable number.

55855171519217 is a deficient number, since it is larger than the sum of its proper divisors (7979310217039).

55855171519217 is an equidigital number, since it uses as much as digits as its factorization.

55855171519217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7979310217038.

The product of its digits is 22050000, while the sum is 62.

The spelling of 55855171519217 in words is "fifty-five trillion, eight hundred fifty-five billion, one hundred seventy-one million, five hundred nineteen thousand, two hundred seventeen".