51264656309 has 2 divisors, whose sum is σ = 51264656310. Its totient is φ = 51264656308.

The previous prime is 51264656293. The next prime is 51264656411. The reversal of 51264656309 is 90365646215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44988531025 + 6276125284 = 212105^2 + 79222^2 .

It is a cyclic number.

It is not a de Polignac number, because 51264656309 - 2⁴ = 51264656293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51264653309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25632328154 + 25632328155.

It is an arithmetic number, because the mean of its divisors is an integer number (25632328155).

Almost surely, 2^51264656309 is an apocalyptic number.

It is an amenable number.

51264656309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51264656309 is an equidigital number, since it uses as much as digits as its factorization.

51264656309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 51264656309 in words is "fifty-one billion, two hundred sixty-four million, six hundred fifty-six thousand, three hundred nine".