5668321661 has 8 divisors (see below), whose sum is σ = 6012204000. Its totient is φ = 5328994320.

The previous prime is 5668321657. The next prime is 5668321663. The reversal of 5668321661 is 1661238665.

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 5668321661 - 2² = 5668321657 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 (5668321663) 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, 1136186 + ... + 1141163.

It is an arithmetic number, because the mean of its divisors is an integer number (751525500).

Almost surely, 2^5668321661 is an apocalyptic number.

It is an amenable number.

5668321661 is a deficient number, since it is larger than the sum of its proper divisors (343882339).

5668321661 is a wasteful number, since it uses less digits than its factorization.

5668321661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277499.

The product of its digits is 311040, while the sum is 44.

The square root of 5668321661 is about 75288.2571255305. The cubic root of 5668321661 is about 1783.0006263847. Note that the first 3 decimals are identical.

The spelling of 5668321661 in words is "five billion, six hundred sixty-eight million, three hundred twenty-one thousand, six hundred sixty-one".