5665331281 has 4 divisors (see below), whose sum is σ = 5706089200. Its totient is φ = 5624573364.

The previous prime is 5665331233. The next prime is 5665331293. The reversal of 5665331281 is 1821335665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5665331281 is a prime.

It is a super-2 number, since 2×5665331281² = 64191957046954201922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665331981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20378751 + ... + 20379028.

It is an arithmetic number, because the mean of its divisors is an integer number (1426522300).

Almost surely, 2^5665331281 is an apocalyptic number.

It is an amenable number.

5665331281 is a deficient number, since it is larger than the sum of its proper divisors (40757919).

5665331281 is a wasteful number, since it uses less digits than its factorization.

5665331281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40757918.

The product of its digits is 129600, while the sum is 40.

The square root of 5665331281 is about 75268.3949676091. The cubic root of 5665331281 is about 1782.6870246033.

The spelling of 5665331281 in words is "five billion, six hundred sixty-five million, three hundred thirty-one thousand, two hundred eighty-one".