5665121279 has 8 divisors (see below), whose sum is σ = 5680698240. Its totient is φ = 5649566616.

The previous prime is 5665121243. The next prime is 5665121281. The reversal of 5665121279 is 9721215665.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5665121279 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 (5665121479) 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, 586124 + ... + 595710.

It is an arithmetic number, because the mean of its divisors is an integer number (710087280).

Almost surely, 2^5665121279 is an apocalyptic number.

5665121279 is a deficient number, since it is larger than the sum of its proper divisors (15576961).

5665121279 is an equidigital number, since it uses as much as digits as its factorization.

5665121279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11149.

The product of its digits is 226800, while the sum is 44.

The square root of 5665121279 is about 75266.9999335698. Note that the first 4 decimals coincide. The cubic root of 5665121279 is about 1782.6649975027.

The spelling of 5665121279 in words is "five billion, six hundred sixty-five million, one hundred twenty-one thousand, two hundred seventy-nine".