5665121243 has 2 divisors, whose sum is σ = 5665121244. Its totient is φ = 5665121242.

The previous prime is 5665121159. The next prime is 5665121281. The reversal of 5665121243 is 3421215665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5665121243 - 2¹² = 5665117147 is a prime.

It is not a weakly prime, because it can be changed into another prime (5665121543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832560621 + 2832560622.

It is an arithmetic number, because the mean of its divisors is an integer number (2832560622).

Almost surely, 2^5665121243 is an apocalyptic number.

5665121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

5665121243 is an equidigital number, since it uses as much as digits as its factorization.

5665121243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 35.

The square root of 5665121243 is about 75266.9996944212. Note that the first 3 decimals coincide. The cubic root of 5665121243 is about 1782.6649937266.

The spelling of 5665121243 in words is "five billion, six hundred sixty-five million, one hundred twenty-one thousand, two hundred forty-three".