51664673 has 2 divisors, whose sum is σ = 51664674. Its totient is φ = 51664672.

The previous prime is 51664663. The next prime is 51664687. The reversal of 51664673 is 37646615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29073664 + 22591009 = 5392^2 + 4753^2 .

It is a cyclic number.

It is not a de Polignac number, because 51664673 - 2¹⁶ = 51599137 is a prime.

It is not a weakly prime, because it can be changed into another prime (51664663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25832336 + 25832337.

It is an arithmetic number, because the mean of its divisors is an integer number (25832337).

Almost surely, 2^51664673 is an apocalyptic number.

It is an amenable number.

51664673 is a deficient number, since it is larger than the sum of its proper divisors (1).

51664673 is an equidigital number, since it uses as much as digits as its factorization.

51664673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 51664673 is about 7187.8142018280. The cubic root of 51664673 is about 372.4470696379.

The spelling of 51664673 in words is "fifty-one million, six hundred sixty-four thousand, six hundred seventy-three".