55004550991 has 16 divisors (see below), whose sum is σ = 65447089344. Its totient is φ = 45709069824.

The previous prime is 55004550983. The next prime is 55004551009. The reversal of 55004550991 is 19905540055.

It is a cyclic number.

It is not a de Polignac number, because 55004550991 - 2³ = 55004550983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55004550901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5405556 + ... + 5415721.

It is an arithmetic number, because the mean of its divisors is an integer number (4090443084).

Almost surely, 2^55004550991 is an apocalyptic number.

55004550991 is a deficient number, since it is larger than the sum of its proper divisors (10442538353).

55004550991 is a wasteful number, since it uses less digits than its factorization.

55004550991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10821330.

The product of its (nonzero) digits is 202500, while the sum is 43.

The spelling of 55004550991 in words is "fifty-five billion, four million, five hundred fifty thousand, nine hundred ninety-one".