5671705661 has 4 divisors (see below), whose sum is σ = 5674547772. Its totient is φ = 5668863552.

The previous prime is 5671705651. The next prime is 5671705679. The reversal of 5671705661 is 1665071765.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148986436 + 5522719225 = 12206^2 + 74315^2 .

It is a cyclic number.

It is not a de Polignac number, because 5671705661 - 2¹⁰ = 5671704637 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 (5671705651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1418060 + ... + 1422053.

It is an arithmetic number, because the mean of its divisors is an integer number (1418636943).

Almost surely, 2^5671705661 is an apocalyptic number.

It is an amenable number.

5671705661 is a deficient number, since it is larger than the sum of its proper divisors (2842111).

5671705661 is a wasteful number, since it uses less digits than its factorization.

5671705661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842110.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 5671705661 is about 75310.7273965668. The cubic root of 5671705661 is about 1783.3553741785.

The spelling of 5671705661 in words is "five billion, six hundred seventy-one million, seven hundred five thousand, six hundred sixty-one".