5605605666 has 48 divisors (see below), whose sum is σ = 12277137600. Its totient is φ = 1848333024.

The previous prime is 5605605661. The next prime is 5605605683. The reversal of 5605605666 is 6665065065.

It is not an unprimeable number, because it can be changed into a prime (5605605661) 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, 1614180 + ... + 1617648.

It is an arithmetic number, because the mean of its divisors is an integer number (255773700).

Almost surely, 2^5605605666 is an apocalyptic number.

5605605666 is an abundant number, since it is smaller than the sum of its proper divisors (6671531934).

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

5605605666 is a wasteful number, since it uses less digits than its factorization.

5605605666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423 (or 4420 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The square root of 5605605666 is about 74870.5927985080. The cubic root of 5605605666 is about 1776.4003407972.

It can be divided in two parts, 560 and 5605666, that added together give a triangular number (5606226 = T₃₃₄₈).

The spelling of 5605605666 in words is "five billion, six hundred five million, six hundred five thousand, six hundred sixty-six".