55561173255 has 72 divisors (see below), whose sum is σ = 116900420832. Its totient is φ = 24295049856.

The previous prime is 55561173229. The next prime is 55561173257. The reversal of 55561173255 is 55237116555.

55561173255 is a `hidden beast` number, since 5 + 5 + 5 + 611 + 7 + 3 + 25 + 5 = 666.

It is not a de Polignac number, because 55561173255 - 2⁶ = 55561173191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 55561173255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561173257) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 497064 + ... + 598493.

It is an arithmetic number, because the mean of its divisors is an integer number (1623616956).

Almost surely, 2^55561173255 is an apocalyptic number.

55561173255 is an abundant number, since it is smaller than the sum of its proper divisors (61339247577).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55561173255 is a wasteful number, since it uses less digits than its factorization.

55561173255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095605 (or 1095595 counting only the distinct ones).

The product of its digits is 787500, while the sum is 45.

The spelling of 55561173255 in words is "fifty-five billion, five hundred sixty-one million, one hundred seventy-three thousand, two hundred fifty-five".