5663685661 has 8 divisors (see below), whose sum is σ = 5994716000. Its totient is φ = 5335949520.

The previous prime is 5663685649. The next prime is 5663685673. The reversal of 5663685661 is 1665863665.

It is an interprime number because it is at equal distance from previous prime (5663685649) and next prime (5663685673).

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 5663685661 - 2¹⁵ = 5663652893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5663685599 and 5663685608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5663685611) 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 7 ways as a sum of consecutive naturals, for example, 820011 + ... + 826888.

It is an arithmetic number, because the mean of its divisors is an integer number (749339500).

Almost surely, 2^5663685661 is an apocalyptic number.

It is an amenable number.

5663685661 is a deficient number, since it is larger than the sum of its proper divisors (331030339).

5663685661 is a wasteful number, since it uses less digits than its factorization.

5663685661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647099.

The product of its digits is 4665600, while the sum is 52.

The square root of 5663685661 is about 75257.4624937620. The cubic root of 5663685661 is about 1782.5144010109.

The spelling of 5663685661 in words is "five billion, six hundred sixty-three million, six hundred eighty-five thousand, six hundred sixty-one".