55129581169209 has 24 divisors (see below), whose sum is σ = 79726731926400. Its totient is φ = 36709157628000.

The previous prime is 55129581169207. The next prime is 55129581169277. The reversal of 55129581169209 is 90296118592155.

55129581169209 is a `hidden beast` number, since 5 + 5 + 1 + 29 + 581 + 1 + 6 + 9 + 20 + 9 = 666.

It is not a de Polignac number, because 55129581169209 - 2¹ = 55129581169207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55129581169207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 314958487 + ... + 315133475.

It is an arithmetic number, because the mean of its divisors is an integer number (3321947163600).

Almost surely, 2^{55129581169209} is an apocalyptic number.

It is an amenable number.

55129581169209 is a deficient number, since it is larger than the sum of its proper divisors (24597150757191).

55129581169209 is a wasteful number, since it uses less digits than its factorization.

55129581169209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216605 (or 216602 counting only the distinct ones).

The product of its (nonzero) digits is 17496000, while the sum is 63.

The spelling of 55129581169209 in words is "fifty-five trillion, one hundred twenty-nine billion, five hundred eighty-one million, one hundred sixty-nine thousand, two hundred nine".