5605011661 has 8 divisors (see below), whose sum is σ = 5714428824. Its totient is φ = 5495730240.

The previous prime is 5605011653. The next prime is 5605011677. The reversal of 5605011661 is 1661105065.

It can be written as a sum of positive squares in 4 ways, for example, as 1287733225 + 4317278436 = 35885^2 + 65706^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5605011661 - 2³ = 5605011653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5605011631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51531 + ... + 117751.

It is an arithmetic number, because the mean of its divisors is an integer number (714303603).

Almost surely, 2^5605011661 is an apocalyptic number.

It is an amenable number.

5605011661 is a deficient number, since it is larger than the sum of its proper divisors (109417163).

5605011661 is a wasteful number, since it uses less digits than its factorization.

5605011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67871.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 5605011661 is about 74866.6258155127. The cubic root of 5605011661 is about 1776.3375924210.

The spelling of 5605011661 in words is "five billion, six hundred five million, eleven thousand, six hundred sixty-one".