51664577 has 2 divisors, whose sum is σ = 51664578. Its totient is φ = 51664576.

The previous prime is 51664567. The next prime is 51664619. The reversal of 51664577 is 77546615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32993536 + 18671041 = 5744^2 + 4321^2 .

It is a cyclic number.

It is not a de Polignac number, because 51664577 - 2¹⁰ = 51663553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51664517) 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, 25832288 + 25832289.

It is an arithmetic number, because the mean of its divisors is an integer number (25832289).

Almost surely, 2^51664577 is an apocalyptic number.

It is an amenable number.

51664577 is a deficient number, since it is larger than the sum of its proper divisors (1).

51664577 is an equidigital number, since it uses as much as digits as its factorization.

51664577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 41.

The square root of 51664577 is about 7187.8075238559. The cubic root of 51664577 is about 372.4468389520.

The spelling of 51664577 in words is "fifty-one million, six hundred sixty-four thousand, five hundred seventy-seven".