5605122666 has 128 divisors (see below), whose sum is σ = 14009490432. Its totient is φ = 1468800000.

The previous prime is 5605122659. The next prime is 5605122671. The reversal of 5605122666 is 6662215065.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3660321 + ... + 3661851.

It is an arithmetic number, because the mean of its divisors is an integer number (109449144).

Almost surely, 2^5605122666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5605122666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7004745216).

5605122666 is an abundant number, since it is smaller than the sum of its proper divisors (8404367766).

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

5605122666 is a wasteful number, since it uses less digits than its factorization.

5605122666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 5605122666 is about 74867.3671635379. The cubic root of 5605122666 is about 1776.3493188940.

It can be divided in two parts, 5605 and 122666, that added together give a triangular number (128271 = T₅₀₆).

The spelling of 5605122666 in words is "five billion, six hundred five million, one hundred twenty-two thousand, six hundred sixty-six".