55521205311 has 64 divisors (see below), whose sum is σ = 87751641600. Its totient is φ = 30782768640.

The previous prime is 55521205279. The next prime is 55521205339. The reversal of 55521205311 is 11350212555.

It is not a de Polignac number, because 55521205311 - 2⁵ = 55521205279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55521205391) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43273876 + ... + 43275158.

It is an arithmetic number, because the mean of its divisors is an integer number (1371119400).

Almost surely, 2^55521205311 is an apocalyptic number.

55521205311 is a deficient number, since it is larger than the sum of its proper divisors (32230436289).

55521205311 is a wasteful number, since it uses less digits than its factorization.

55521205311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136.

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 55521205311 its reverse (11350212555), we get a palindrome (66871417866).

The spelling of 55521205311 in words is "fifty-five billion, five hundred twenty-one million, two hundred five thousand, three hundred eleven".